first responsive adjustments done

Natours/starter/css/style.css

@@ -1,4 +1,19 @@
 @charset "UTF-8";
+/*
+ * 0 - 600px : Phone
+ * 600 - 900px : Tablet portrait
+ * 900 - 1200px : Tablet landscape
+ * 1200 - 1800px : Normal desktop
+ * 1800px + : Big desktop
+
+ * $breakpoint argument choices
+   - phone
+   - tab-port
+   - tab-land
+   - big-desktop
+
+   1em = 16px
+ */
 *,
 ::after,
 ::before {
@@ -8,10 +23,22 @@
 
 html {
   font-size: 62.5%; }
+  @media (min-width: 112.5em) {
+    html {
+      font-size: 75%; } }
+  @media (max-width: 75em) {
+    html {
+      font-size: 56.25%; } }
+  @media (max-width: 56.25em) {
+    html {
+      font-size: 50%; } }
 
 body {
   padding: 3rem;
   box-sizing: border-box; }
+  @media (max-width: 56.25em) {
+    body {
+      padding: 0; } }
 
 @keyframes slideLeft {
   0% {
@@ -42,7 +69,7 @@ body {
     opacity: 1; } }
 
 body {
-  font-family: "Lato",Verdana, Geneva, Tahoma, sans-serif;
+  font-family: "Lato", Verdana, Geneva, Tahoma, sans-serif;
   font-weight: 400;
   /* font-size: 16px; */
   line-height: 1.7;
@@ -60,6 +87,10 @@ body {
     animation-name: slideLeft;
     animation-duration: 1s;
     animation-timing-function: ease-in; }
+    @media (max-width: 37.5em) {
+      .heading--primary-main {
+        letter-spacing: 1rem;
+        font-size: 5rem; } }
   .heading--primary-sub {
     display: block;
     font-size: 2rem;
@@ -68,6 +99,9 @@ body {
     animation-name: slideRight;
     animation-duration: 1s;
     animation-timing-function: ease-in; }
+    @media (max-width: 37.5em) {
+      .heading--primary-sub {
+        letter-spacing: .5rem; } }
 
 .heading--secondary {
   font-size: 3.5rem;
@@ -79,7 +113,13 @@ body {
   background-clip: 0;
   -webkit-background-clip: text;
   color: transparent;
-  transition: all .2s; }
+  transition: all 0.2s; }
+  @media (max-width: 56.25em) {
+    .heading--secondary {
+      font-size: 3rem; } }
+  @media (max-width: 37.5em) {
+    .heading--secondary {
+      font-size: 2.5rem; } }
   .heading--secondary:hover {
     transform: skewY(2deg) skewX(15deg) scale(1.1);
     text-shadow: 0.5rem 1rem 2rem rgba(0, 0, 0, 0.2); }
@@ -539,6 +579,9 @@ body {
         animation: moveInRight 1s ease-out;
     }
     */ }
+  @media (max-width: 37.5em) {
+    .header {
+      clip-path: polygon(0% 0%, 100% 0%, 100% 85vh, 0% 100%); } }
   .header__logo-box {
     position: absolute;
     top: 4rem;
@@ -562,6 +605,13 @@ body {
   margin: 0 auto; }
   .row:not(:last-child) {
     margin-bottom: 8rem; }
+    @media (max-width: 56.25em) {
+      .row:not(:last-child) {
+        margin-bottom: 6rem; } }
+  @media (max-width: 56.25em) {
+    .row {
+      max-width: 50rem;
+      padding: 0 3rem; } }
   .row::after {
     content: "";
     display: table;
@@ -570,6 +620,13 @@ body {
     float: left; }
     .row [class^='col-']:not(:last-child) {
       margin-right: 6rem; }
+      @media (max-width: 56.25em) {
+        .row [class^='col-']:not(:last-child) {
+          margin-right: 0;
+          margin-bottom: 6rem; } }
+    @media (max-width: 56.25em) {
+      .row [class^='col-'] {
+        width: 100% !important; } }
   .row .col-1-of-2 {
     width: calc((100% - 6rem) / 2); }
   .row .col-1-of-3 {
@@ -588,9 +645,15 @@ body {
   padding: 10rem 0;
   font-size: 1.4rem;
   color: #f7f7f7; }
+  @media (max-width: 56.25em) {
+    .footer {
+      padding: 8rem 0; } }
   .footer__logo-box {
     text-align: center;
     margin-bottom: 8rem; }
+    @media (max-width: 56.25em) {
+      .footer__logo-box {
+        margin-bottom: 6rem; } }
   .footer__logo {
     width: 15rem;
     height: auto; }
@@ -598,6 +661,10 @@ body {
     border-top: 1px solid #777;
     padding-top: 2rem;
     display: inline-block; }
+    @media (max-width: 56.25em) {
+      .footer__navigation {
+        width: 100%;
+        text-align: center; } }
   .footer__list {
     list-style: none; }
   .footer__item {
@@ -621,6 +688,10 @@ body {
     display: inline-block;
     width: 80%;
     float: right; }
+    @media (max-width: 56.25em) {
+      .footer__copyright {
+        width: 100%;
+        float: none; } }
 
 .navigation__checkbox {
   display: none; }
@@ -637,6 +708,14 @@ body {
   box-shadow: 0 1rem 3rem rgba(0, 0, 0, 0.1);
   text-align: center;
   cursor: pointer; }
+  @media (max-width: 56.25em) {
+    .navigation__button {
+      top: 4rem;
+      right: 4rem; } }
+  @media (max-width: 37.5em) {
+    .navigation__button {
+      top: 2.5rem;
+      right: 2.5rem; } }
 
 .navigation__background {
   height: 6rem;
@@ -648,6 +727,14 @@ body {
   background-image: radial-gradient(#7ed56f, #28b485);
   z-index: 1000;
   transition: transform 0.8s cubic-bezier(0.83, 0, 0.17, 1); }
+  @media (max-width: 56.25em) {
+    .navigation__background {
+      top: 4.5rem;
+      right: 4.5rem; } }
+  @media (max-width: 37.5em) {
+    .navigation__background {
+      top: 3rem;
+      right: 3rem; } }
 
 .navigation__nav {
   height: 100vh;
@@ -737,6 +824,9 @@ body {
   background-color: #f7f7f7;
   padding: 25rem 0;
   margin-top: -20vh; }
+  @media (max-width: 56.25em) {
+    .section-about {
+      padding: 20rem 0; } }
 
 .section-features {
   padding: 20rem 0;
@@ -746,15 +836,24 @@ body {
   transform: skewY(-7deg); }
   .section-features > * {
     transform: skewY(7deg); }
+  @media (max-width: 56.25em) {
+    .section-features {
+      padding: 15rem 0; } }
 
 .section-tours {
   background-color: #f7f7f7;
   padding: 25rem 0 15rem 0;
   margin-top: -10rem; }
+  @media (max-width: 56.25em) {
+    .section-tours {
+      padding: 20rem 0 10rem 0; } }
 
 .section-stories {
   position: relative;
   padding: 15rem 0; }
+  @media (max-width: 56.25em) {
+    .section-stories {
+      padding: 10rem 0; } }
 
 .section-book {
   padding: 15rem 0;