grosinger.net/hugo/themes/timeline/assets/scss/style.scss

$primary: #3f51b5;
$dark-primary: #303f9f;
$light-primary: #c5cae9;
$text: #ffffff;
$primary-text: #212121;
$secondary-text: #757575;
$accent: #10bbff;

.hero-table {
  margin-left: 10%;
  margin-right: 10%;
}

section {
  padding: 100px 0;
}

.timeline {
  position: relative;

  &::before {
    content: "";
    background: $light-primary;
    width: 5px;
    height: 95%;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
  }
}

.timeline-item {
  width: 100%;
  margin-bottom: 70px;

  .timeline-content {
    padding: 20px;
    padding-bottom: 10px;
  }

  &:nth-child(even) {
    .timeline-content {
      float: right;

      .date {
        right: auto;
        left: 0;
      }

      &::after {
        content: "";
        position: absolute;
        border-style: solid;
        width: 0;
        height: 0;
        top: 0;
        left: -20px;
        border-width: 18px 20px 18px 0;
        border-color: transparent #10bbff transparent transparent;
      }
    }
  }

  &::after {
    content: "";
    display: block;
    clear: both;
  }
}

.timeline-content {
  position: relative;
  width: 45%;
  padding: 10px 30px;
  border-radius: 4px;
  background: #f5f5f5;
  box-shadow: 0 20px 25px -15px rgba(0, 0, 0, 0.3);

  &::after {
    content: "";
    position: absolute;
    border-style: solid;
    width: 0;
    height: 0;
    top: 0;
    right: -20px;
    border-width: 18px 0 18px 20px;
    border-color: transparent transparent transparent #10bbff;
  }
}

.timeline-img {
  width: 30px;
  height: 30px;
  background: #10bbff;
  border-radius: 50%;
  position: absolute;
  left: 50%;
  margin-top: 5px;
  margin-left: -15px;
}

.timeline-card {
  padding: 0 !important;

  p {
    padding: 0 20px;
  }

  a {
    margin-left: 20px;
  }
}

.timeline-item {
  .timeline-img-header {
    background: linear-gradient(rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.4)),
      url("https://picsum.photos/1000/800/?random") center center no-repeat;
    background-size: cover;
  }
}

.timeline-img-header {
  height: 200px;
  position: relative;
  margin-bottom: 20px;

  h2 {
    color: $text;
    position: absolute;
    bottom: 5px;
    left: 20px;
  }
}

blockquote {
  margin-top: 30px;
  color: $secondary-text;
  border-left-color: $primary;
  padding: 0 20px;
}

.date {
  background: $accent;
  display: inline-block;
  color: $text;
  padding: 5px;
  position: absolute;
  top: 0;
  right: 0;
}

@media screen and (max-width: 768px) {
  .timeline {
    &::before {
      left: 30px;
    }

    .timeline-img {
      left: 30px;
    }

    .timeline-content {
      max-width: 100%;
      width: auto;
      margin-left: 70px;
    }

    .timeline-item {
      &:nth-child(even) {
        .timeline-content {
          float: none;
        }
      }

      &:nth-child(odd) {
        .timeline-content {
          border-radius: 0 4px 4px 4px;

          &::after {
            content: "";
            position: absolute;
            border-style: solid;
            width: 0;
            height: 0;
            top: 0;
            left: -20px;
            border-width: 18px 20px 18px 0;
            border-color: transparent #f5f5f5 transparent transparent;
          }
        }
      }
    }
  }
}