basic styling

assets/stylesheets/course.css

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+.course-card {
+  display: flex;
+  flex-direction: column;
+  min-height: 30vh;
+  padding: var(--grid-gutter);
+
+  border-radius: 7px;
+  box-shadow: var(--card-box-shadow);
+
+  & > * + * {
+    margin-top: var(--grid-gutter);
+  }
+}
+
+.course-card__categories {
+  flex: 0 0 var(--line-height);
+  color: var(--color-text-grey);
+}
+
+.course-card__title {
+  flex: 1 1 auto;
+
+  & h2 {
+    margin: 0;
+  }
+}
+
+.course-card__description {
+  flex: 1 1 auto;
+
+  & p {
+    margin: 0;
+  }
+}
+
+.course-card__link {
+  flex: 0 0 auto;
+
+  & a {
+    display: inline-block;
+    padding-bottom: 0.3em;
+    border-bottom: 1px solid var(--color-link-content);
+    text-transform: uppercase;
+    color: var(--color-link-content);
+  }
+}

assets/stylesheets/global.css

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+body {
+  background-color: var(--color-bg-default);
+  color: var(--color-text-default);
+  font-family: Helvetica Neue, Helvetica, Arial, sans-serif;
+  font-size: 1rem;
+  line-height: var(--line-height);
+}
+
+.wrapper {
+  max-width: 1024px;
+  margin: 0 auto;
+  padding: 0 2vw;
+
+  @media (--breakpoint-desktop) {
+    padding: 0;
+  }
+}
+
+.wrapper-with-sidebar {
+  @media (--breakpoint-desktop) {
+    display: flex;
+  }
+}
+
+.wrapper__sidebar {
+  @media (--breakpoint-desktop) {
+    flex: 0 0 220px;
+    padding: var(--grid-gutter);
+    border-radius: 7px;
+    box-shadow: var(--card-box-shadow);
+
+    & > h2 {
+      margin-bottom: calc(var(--grid-gutter) * 3);
+    }
+  }
+}
+.wrapper__content {
+  padding: var(--grid-gutter) 0;
+
+  @media (--breakpoint-desktop) {
+    flex: 1 1 auto;
+    margin-left: var(--grid-gutter);
+  }
+}
+
+.grid-list {
+  display: flex;
+  flex-wrap: wrap;
+  justify-content: space-between;
+  margin: 0 calc(var(--grid-gutter) / 2 * -1);
+
+  & > * {
+    box-sizing: border-box;
+    margin: 0 calc(var(--grid-gutter) / 2) var(--grid-gutter);
+    flex: 0 0 calc(50% - var(--grid-gutter));
+
+    @media (--breakpoint-desktop) {
+      flex: 0 0 calc(33% - var(--grid-gutter));
+    }
+  }
+}
+
+.grid-list-small {
+  display: flex;
+  flex-wrap: wrap;
+  justify-content: space-between;
+  margin: 0 calc(var(--grid-gutter) / 2 * -1);
+
+  & > * {
+    box-sizing: border-box;
+    margin: 0 calc(var(--grid-gutter) / 2) var(--grid-gutter);
+    flex: 0 0 calc(50% - var(--grid-gutter));
+  }
+}
+
+.table-of-contents {
+  & ul {
+    list-style: none;
+    margin: var(--grid-gutter) 0;
+    padding: 0;
+    padding-left: calc(var(--grid-gutter) * 2);
+
+    & li {
+      margin: 0 0 var(--grid-gutter);
+      padding: 0;
+    }
+
+    & a {
+      display: block;
+
+      &.active {
+        position: relative;
+        font-weight: bold;
+
+        &:before,
+        &:after {
+          position: absolute;
+          top: 0;
+        }
+        &:before {
+          content: '';
+          left: calc(var(--grid-gutter) * 3 * -1);
+          bottom: 0;
+          width: 3px;
+          background: var(--color-course-active);
+        }
+        &:after {
+          content: '👁';
+          left: calc(var(--grid-gutter) * 2 * -1);
+        }
+      }
+    }
+  }
+}
+
+.sidebar-menu {
+  & ul {
+    list-style: none;
+    margin: var(--grid-gutter) 0;
+    padding: 0;
+
+    & li {
+      margin: 0 0 var(--grid-gutter);
+      padding: 0;
+    }
+
+    & a {
+      display: block;
+
+      &.active {
+        font-weight: bold;
+      }
+    }
+  }
+}

assets/stylesheets/header.css

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+.header {
+  display: flex;
+  flex-wrap: wrap;
+  
+  margin-top: var(--grid-gutter);
+  padding-bottom: var(--grid-gutter);
+  margin-bottom: var(--grid-gutter);
+
+  border-bottom: 2px solid var(--color-bg-separator);
+
+  @media (--breakpoint-desktop) {
+    flex-wrap: nowrap;
+  }
+
+  & .header__logo,
+  & .header__navarea {
+    display: flex;
+    flex: 0 0 100%;
+  }
+
+  & .header__logo {
+    align-items: center;
+    
+    @media (--breakpoint-desktop) {
+      flex: 0 0 200px;
+    }
+  }
+
+  & .header__navarea {
+    flex-direction: column;
+    justify-content: space-around;
+
+    @media (--breakpoint-desktop) {
+      flex: 1 0 auto;
+    }
+  }
+}
+
+.header__navarea {
+  & form {
+    display: flex;
+    flex-wrap: wrap;
+
+    @media (--breakpoint-desktop) {
+      justify-content: flex-end;
+    }
+
+    & > * {
+      flex: 0 0 auto;
+    }
+
+    & fieldset {
+      padding: 0.2em 1em;
+      margin: 0;
+      border: none;
+      background: var(--color-bg-grey);
+      color: var(--color-text-grey);
+      border-radius: var(--border-radius);
+      font-size: 0.8em;
+
+      & + fieldset {
+        margin-left: var(--grid-gutter)
+      }
+
+      & label + select {
+        margin-left: 0.5em;
+      }
+    }
+  }
+}
+
+.navigation {
+  & nav {
+    & ul {
+      display: flex;
+      list-style: none;
+      flex-wrap: wrap;
+      margin: 0;
+      padding: 0;
+
+      @media (--breakpoint-desktop) {
+        justify-content: flex-end;
+      }
+
+      & li {
+        margin: 0;
+
+        & + li {
+          margin-left: calc(var(--grid-gutter) / 4);
+        }
+
+        & a {
+          display: block;
+          text-transform: uppercase;
+          font-weight: bold;
+          padding: 0.7em 1em;
+          color: var(--color-text-grey);
+          border-radius: var(--border-radius);
+
+          &.active,
+          &:hover {
+            background: var(--color-bg-grey);
+          }
+
+          &.active {
+            color: var(--color-text-default);
+          }
+        }
+      }
+    }
+  }
+}
+

assets/stylesheets/homepage.css

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+.hero {
+  display: flex;
+  justify-content: space-between;
+}
+.hero__image {
+  background-color: #20B5B6;
+  width: 65%;
+  height: 600px;
+  border-radius: .375rem;
+  box-shadow: var(--card-box-shadow);
+}
+.featured-cards-list {
+  width: 30%;
+  height: 600px;
+  display:flex;
+  flex-direction: column;
+  justify-content: space-between;
+}
+
+.featured-cards__list {
+  background-color: #00AAE0;
+  height: 150px;
+  border-radius: .375rem;
+  box-shadow: var(--card-box-shadow);
+}

assets/stylesheets/module.css

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+.module {
+  max-width: 1024px;
+  margin: 0 auto;
+  padding: 0 2vw;
+
+  @media (--breakpoint-desktop) {
+    padding: 0;
+  }
+
+
+  & img {
+    width: 100%;
+    height: auto;
+  }
+
+  & + .module {
+    margin-top: var(--grid-gutter);
+  }
+}

assets/stylesheets/style.css

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+@import 'normalize.css';
+
+@import './variables';
+
+@import './typography';
+@import './global';
+@import './header';
+
+@import './homepage';
+@import './course';
+@import './module';

assets/stylesheets/typography.css

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+h1, h2, h3, h4, h5, h6 {
+  &:first-child {
+    margin-top: 0;
+  }
+}
+
+a {
+  color: inherit;
+  text-decoration: none;
+}

assets/stylesheets/variables.css

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+@custom-media --breakpoint-desktop (min-width: 700px);
+
+:root {
+  --grid-gutter: 1rem;
+  --border-radius: 3px;
+
+  --line-height: 1.5em;
+
+  --color-text-default: #2a303a;
+  --color-text-grey: #8091a5;
+
+  --color-link-content: #5c9fef;
+
+  --color-bg-default: #fff;
+  --color-bg-grey: #f7f9fa;
+  --color-bg-separator: #f2f5f7;
+
+  --color-sidebar-bg: #f7f9fa;
+
+  --color-course-active: #536171;
+
+  --card-box-shadow: 0px 1px 3px 0px rgba(0, 0, 0, .45);
+}