diff --git a/Trillo/starter/css/style.css b/Trillo/starter/css/style.css
index f5bdb44..a5debf6 100644
--- a/Trillo/starter/css/style.css
+++ b/Trillo/starter/css/style.css
@@ -66,6 +66,10 @@ body {
   align-items: center;
   justify-content: center;
   flex: 0 0 40%; }
+  @media only screen and (max-width: 31.25em) {
+    .search {
+      order: 1;
+      flex-basis: 100%; } }
   .search__input {
     font-family: inherit;
     font-size: inherit;
@@ -138,10 +142,20 @@ body {
   font-size: 1.4rem;
   list-style: none;
   margin-top: 3.5rem; }
+  @media only screen and (max-width: 56.25em) {
+    .side-nav {
+      display: flex;
+      margin: 0; } }
   .side-nav__item {
     position: relative; }
     .side-nav__item:not(:last-child) {
       margin-bottom: 0.5rem; }
+      @media only screen and (max-width: 56.25em) {
+        .side-nav__item:not(:last-child) {
+          margin-bottom: 0; } }
+    @media only screen and (max-width: 56.25em) {
+      .side-nav__item {
+        flex: 1; } }
   .side-nav__item::before {
     content: "";
     position: absolute;
@@ -167,17 +181,34 @@ body {
     padding: 1.5rem 3rem;
     position: relative;
     z-index: 10; }
+    @media only screen and (max-width: 56.25em) {
+      .side-nav__link:link, .side-nav__link:visited {
+        justify-content: center;
+        padding: 2rem; } }
+    @media only screen and (max-width: 37.5em) {
+      .side-nav__link:link, .side-nav__link:visited {
+        flex-direction: column;
+        padding: 1rem; } }
   .side-nav__icon {
     width: 1.75rem;
     height: 1.75rem;
     margin-right: 2rem;
     fill: currentColor; }
+    @media only screen and (max-width: 37.5em) {
+      .side-nav__icon {
+        margin-right: 0;
+        margin-bottom: 0.7rem;
+        width: 1.5rem;
+        height: 1.5rem; } }
 
 .legal {
   font-size: 1.2rem;
   color: var(--color-grey-light-4);
   text-align: center;
   padding: 2.5rem; }
+  @media only screen and (max-width: 56.25em) {
+    .legal {
+      display: none; } }
 
 .gallery {
   display: flex; }
@@ -195,6 +226,10 @@ body {
     text-transform: uppercase;
     letter-spacing: 1px;
     padding: 1.5rem 3rem; }
+    @media only screen and (max-width: 37.5em) {
+      .overview__heading {
+        font-size: 1.8rem;
+        padding: 1.25rem 2rem; } }
   .overview__stars {
     margin-right: auto;
     display: flex; }
@@ -218,13 +253,22 @@ body {
     flex-direction: column;
     align-items: center;
     justify-content: center; }
+    @media only screen and (max-width: 37.5em) {
+      .overview__rating {
+        padding: 0 1.5rem; } }
   .overview__rating-average {
     font-size: 2.25rem;
     font-weight: 300;
     margin-bottom: -3px; }
+    @media only screen and (max-width: 37.5em) {
+      .overview__rating-average {
+        font-size: 1.8rem; } }
   .overview__rating-count {
     font-weight: 0.8rem;
     text-transform: uppercase; }
+    @media only screen and (max-width: 37.5em) {
+      .overview__rating-count {
+        font-size: 0.5rem; } }
 
 .btn {
   position: relative;
@@ -310,10 +354,12 @@ body {
       display: inline-block;
       height: 1rem;
       width: 1rem;
-      margin-right: 0.7rem;
-      background-color: var(--color-primary);
-      mask-image: url("../img/chevron-thin-right.svg");
-      mask-size: cover; }
+      margin-right: 0.7rem; }
+      @supports (-webkit-mask-image: url()) or (mask-image: url()) {
+        .list__item::before {
+          background-color: var(--color-primary);
+          mask-image: url("../img/chevron-thin-right.svg");
+          mask-size: cover; } }
 
 .recommend {
   font-size: 1.3rem;
@@ -322,6 +368,8 @@ body {
   align-items: center; }
   .recommend__count {
     margin-right: auto; }
+  .recommend__friends {
+    display: flex; }
   .recommend__photo {
     box-sizing: content-box;
     height: 4rem;
@@ -338,6 +386,10 @@ body {
   margin-bottom: 3.5rem;
   position: relative;
   overflow: hidden; }
+  @media only screen and (max-width: 56.25em) {
+    .review {
+      padding: 2rem;
+      margin-bottom: 3rem; } }
   .review::before {
     content: "\201C";
     position: absolute;
@@ -376,8 +428,11 @@ body {
     color: var(--color-primary); }
 
 .cta {
-  padding: 3.5rem;
+  padding: 3.5rem 0;
   text-align: center; }
+  @media only screen and (max-width: 56.25em) {
+    .cta {
+      padding: 2.5rem 0; } }
   .cta__book-now {
     font-size: 2rem;
     font-weight: 300;
@@ -404,9 +459,17 @@ body {
   justify-content: space-between;
   align-items: center;
   font-size: 1.4rem; }
+  @media only screen and (max-width: 68.75em) {
+    .header {
+      flex-wrap: wrap;
+      align-content: space-around;
+      height: 11rem; } }
 
 .content {
   display: flex; }
+  @media only screen and (max-width: 56.25em) {
+    .content {
+      flex-direction: column; } }
 
 .sidebar {
   background-color: var(--color-grey-dark-1);
@@ -426,12 +489,26 @@ body {
   background-color: var(--color-grey-light-1);
   border-bottom: 1px solid var(--color-grey-light-2);
   font-size: 1.4rem; }
+  @media only screen and (max-width: 56.25em) {
+    .detail {
+      padding: 3rem;
+      gap: 3rem; } }
+  @media only screen and (max-width: 37.5em) {
+    .detail {
+      flex-direction: column;
+      gap: 0; } }
 
 .description {
   background-color: white;
   box-shadow: var(--shadow-light);
   padding: 3rem;
   flex: 0 0 60%; }
+  @media only screen and (max-width: 56.25em) {
+    .description {
+      padding: 2rem; } }
+  @media only screen and (max-width: 37.5em) {
+    .description {
+      margin-bottom: 3rem; } }
 
 .user-reviews {
   flex: 1;
diff --git a/Trillo/starter/sass/_base.scss b/Trillo/starter/sass/_base.scss
index 84a7516..3997734 100644
--- a/Trillo/starter/sass/_base.scss
+++ b/Trillo/starter/sass/_base.scss
@@ -33,8 +33,11 @@ Grey dark 3: #999
   --line: 1px solid var(--color-grey-light-2);
 }
 
-$bp-largest: 75em;
-$bp-large: 68.75em;
+$bp-largest: 75em; // 1200px
+$bp-large: 68.75em; // 1100px
+$bp-medium: 56.25em; // 900px
+$bp-small: 37.5em; // 600px
+$bp-smallest: 31.25em; // 500px
 
 * {
   margin: 0;
diff --git a/Trillo/starter/sass/_components.scss b/Trillo/starter/sass/_components.scss
index 7d41805..19d0274 100644
--- a/Trillo/starter/sass/_components.scss
+++ b/Trillo/starter/sass/_components.scss
@@ -11,6 +11,11 @@
   justify-content: center;
   flex: 0 0 40%;
 
+  @media only screen and (max-width: $bp-smallest) {
+    order: 1; // NOTE: changes html order
+    flex-basis: 100%; // flex: 0 0 100%;
+  }
+
   &__input {
     font-family: inherit;
     font-size: inherit;
@@ -121,11 +126,23 @@
   list-style: none;
   margin-top: 3.5rem;
 
+  @media only screen and (max-width: $bp-medium) {
+    display: flex;
+    margin: 0;
+  }
+
   &__item {
     position: relative;
 
     &:not(:last-child) {
       margin-bottom: 0.5rem;
+      @media only screen and (max-width: $bp-medium) {
+        margin-bottom: 0;
+      }
+    }
+
+    @media only screen and (max-width: $bp-medium) {
+      flex: 1;
     }
   }
 
@@ -168,6 +185,16 @@
 
     position: relative;
     z-index: 10;
+
+    @media only screen and (max-width: $bp-medium) {
+      justify-content: center;
+      padding: 2rem;
+    }
+
+    @media only screen and (max-width: $bp-small) {
+      flex-direction: column;
+      padding: 1rem;
+    }
   }
 
   &__icon {
@@ -175,6 +202,13 @@
     height: 1.75rem;
     margin-right: 2rem;
     fill: currentColor; //NOTE: color of current or parent element
+
+    @media only screen and (max-width: $bp-small) {
+      margin-right: 0;
+      margin-bottom: 0.7rem;
+      width: 1.5rem;
+      height: 1.5rem;
+    }
   }
 }
 
@@ -184,6 +218,10 @@
   color: var(--color-grey-light-4);
   text-align: center;
   padding: 2.5rem;
+
+  @media only screen and (max-width: $bp-medium) {
+    display: none;
+  }
 }
 
 // Gallery
@@ -209,6 +247,10 @@
     letter-spacing: 1px;
 
     padding: 1.5rem 3rem;
+    @media only screen and (max-width: $bp-small) {
+      font-size: 1.8rem;
+      padding: 1.25rem 2rem;
+    }
   }
 
   &__stars {
@@ -243,17 +285,27 @@
     flex-direction: column;
     align-items: center;
     justify-content: center;
+
+    @media only screen and (max-width: $bp-small) {
+      padding: 0 1.5rem;
+    }
   }
 
   &__rating-average {
     font-size: 2.25rem;
     font-weight: 300;
     margin-bottom: -3px;
+    @media only screen and (max-width: $bp-small) {
+      font-size: 1.8rem;
+    }
   }
 
   &__rating-count {
     font-weight: 0.8rem;
     text-transform: uppercase;
+    @media only screen and (max-width: $bp-small) {
+      font-size: 0.5rem;
+    }
   }
 }
 
@@ -400,9 +452,12 @@
 
       // NOTE: Newer browsers - masks
       // icon mask that lets you see the background color
-      background-color: var(--color-primary);
-      mask-image: url("../img/chevron-thin-right.svg");
-      mask-size: cover;
+      // NOTE: feature query (requires a value)
+      @supports (-webkit-mask-image: url()) or (mask-image: url()) {
+        background-color: var(--color-primary);
+        mask-image: url("../img/chevron-thin-right.svg");
+        mask-size: cover;
+      }
     }
   }
 }
@@ -420,6 +475,7 @@
   }
 
   &__friends {
+    display: flex;
   }
 
   &__photo {
@@ -446,6 +502,11 @@
   position: relative;
   overflow: hidden;
 
+  @media only screen and (max-width: $bp-medium) {
+    padding: 2rem;
+    margin-bottom: 3rem;
+  }
+
   &::before {
     content: "\201C"; // NOTE: html entity
     position: absolute;
@@ -503,9 +564,13 @@
 
 // cta
 .cta {
-  padding: 3.5rem;
+  padding: 3.5rem 0;
   text-align: center;
 
+  @media only screen and (max-width: $bp-medium) {
+    padding: 2.5rem 0;
+  }
+
   &__book-now {
     font-size: 2rem;
     font-weight: 300;
diff --git a/Trillo/starter/sass/_layout.scss b/Trillo/starter/sass/_layout.scss
index bf6cbbb..7cb2580 100644
--- a/Trillo/starter/sass/_layout.scss
+++ b/Trillo/starter/sass/_layout.scss
@@ -22,10 +22,19 @@
   align-items: center;
 
   font-size: 1.4rem;
+
+  @media only screen and (max-width: $bp-large) {
+    flex-wrap: wrap;
+    align-content: space-around;
+    height: 11rem;
+  }
 }
 
 .content {
   display: flex;
+  @media only screen and (max-width: $bp-medium) {
+    flex-direction: column;
+  }
 }
 
 .sidebar {
@@ -50,6 +59,16 @@
   border-bottom: 1px solid var(--color-grey-light-2);
 
   font-size: 1.4rem;
+
+  @media only screen and (max-width: $bp-medium) {
+    padding: 3rem;
+    gap: 3rem;
+  }
+
+  @media only screen and (max-width: $bp-small) {
+    flex-direction: column;
+    gap: 0;
+  }
 }
 
 .description {
@@ -57,6 +76,12 @@
   box-shadow: var(--shadow-light);
   padding: 3rem;
   flex: 0 0 60%;
+  @media only screen and (max-width: $bp-medium) {
+    padding: 2rem;
+  }
+  @media only screen and (max-width: $bp-small) {
+    margin-bottom: 3rem;
+  }
 }
 
 .user-reviews {