ozgurkon-2021-site/themes/devfest-theme-hugo/assets/style/partials/_header.scss

body > header {

  position: fixed;
  top: 0;
  z-index: 100;
  width: 100vw;
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: var(--toolbar-height);
  padding: 0 var(--container-margin);
  box-shadow: 0 var(--space-1) var(--space-2) var(--darken-1);
  background: var(--primary);
  color: var(--primary-txt);

  .logo img {
    height: calc(var(--toolbar-height) - (2 * var(--space-2)));
  }

  label {
    display: none;
    --size: 1.5rem;
    height: var(--size);
    width: var(--size);
    opacity: .5;
    padding: .1em;
    border: var(--space-2) solid transparent; // Extending the hit area
    outline-offset: var(--space-2);
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center center;
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><path fill="white" d="M16 132h416c8.837 0 16-7.163 16-16V76c0-8.837-7.163-16-16-16H16C7.163 60 0 67.163 0 76v40c0 8.837 7.163 16 16 16zm0 160h416c8.837 0 16-7.163 16-16v-40c0-8.837-7.163-16-16-16H16c-8.837 0-16 7.163-16 16v40c0 8.837 7.163 16 16 16zm0 160h416c8.837 0 16-7.163 16-16v-40c0-8.837-7.163-16-16-16H16c-8.837 0-16 7.163-16 16v40c0 8.837 7.163 16 16 16z"></path></svg>');

    &:hover, &:focus {
      opacity: 1;
      outline: thin dotted currentColor;
    }
  }

  input[type=checkbox]:checked ~ label {
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 352 512"><path fill="white" d="M242.72 256l100.07-100.07c12.28-12.28 12.28-32.19 0-44.48l-22.24-22.24c-12.28-12.28-32.19-12.28-44.48 0L176 189.28 75.93 89.21c-12.28-12.28-32.19-12.28-44.48 0L9.21 111.45c-12.28 12.28-12.28 32.19 0 44.48L109.28 256 9.21 356.07c-12.28 12.28-12.28 32.19 0 44.48l22.24 22.24c12.28 12.28 32.2 12.28 44.48 0L176 322.72l100.07 100.07c12.28 12.28 32.2 12.28 44.48 0l22.24-22.24c12.28-12.28 12.28-32.19 0-44.48L242.72 256z"></path></svg>');
  }

  nav {
    display: flex;
    align-items: center;

    a {
      display: block;
      text-transform: uppercase;
      padding: 0 var(--space-3);
      text-decoration: none;
      line-height: calc(var(--toolbar-height) - (4 * var(--space-2)));;
      color: inherit;
      opacity: .5;
      font-weight: 200;
      transition: all var(--animation);
      border-bottom: medium solid transparent;
      border-radius: 5%;

      &:focus, &:hover {
        text-shadow: var(--extruded-dark);
        opacity: .75;
      }

      &.active {
        opacity: 1;
        border-bottom-color: currentColor;
      }
    }
  }
}

@media (max-width: 60rem) {
  body > header {
    flex-wrap: wrap;

    label {
      display: block;
    }

    nav {
      display: none;
      width: 100%;
      background: var(--primary);
      flex-direction: column;
      justify-content: flex-start;

      a {
        width: 100%;

        &.active {
          border-bottom-width: thin;
          border-bottom-color: var(--lighten-2);
        }
      }
    }

    input[type=checkbox]:checked ~ nav {
      display: block;
    }
  }
}