hugo-theme-hello-friend/source/css/main.css

html {
  box-sizing: border-box;
}

*,
*:before,
*:after {
  box-sizing: inherit;
}

body {
  margin: 0;
  padding: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Roboto", "Segoe UI",  Helvetica, Arial, sans-serif;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.54;
  background-color: var(--light-background);
  color: var(--light-color);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -webkit-overflow-scrolling: touch;
  -webkit-text-size-adjust: 100%;

  @media (--phone) {
    font-size: 1rem;
  }

  &.dark-theme {
    background-color: var(--dark-background);
    color: var(--dark-color);
  }
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.3;
}

h1 {
  font-size: 2.625rem;
}

h2 {
  font-size: 1.625rem;
}

h3 {
  font-size: 1.375rem;
}

h4 {
  font-size: 1.125rem;
}

@media (--phone) {
  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.4rem;
  }

  h3 {
    font-size: 1.15rem;
  }

  h4 {
    font-size: 1.125rem;
  }
}

a {
  color: inherit;
}

img {
  display: block;
  max-width: 100%;

  &.left {
    margin-right: auto;
  }

  &.center {
    margin-left: auto;
    margin-right: auto;
  }

  &.right {
    margin-left: auto;
  }
}

figure {
  display: table;
  max-width: 100%;
  margin: 25px 0;

  &.left {
    margin-right: auto;
  }

  &.center {
    margin-left: auto;
    margin-right: auto;
  }

  &.right {
    margin-left: auto;
  }

  figcaption {
    font-size: .9rem;
    margin-top: 5px;
    opacity: .8;

    &.left {
      text-align: left;
    }

    &.center {
      text-align: center;
    }

    &.right {
      text-align: right;
    }
  }
}

code {
  font-family: Consolas,Monaco,Andale Mono,Ubuntu Mono,monospace;
  background: var(--light-background-secondary);
  padding: 1px 6px;
  margin: 0 2px;
  border-radius: 5px;
  font-size: .9rem;
  font-weight: normal;

  .dark-theme & {
    background: var(--dark-background-secondary);
  }
}

pre {
  background: #212020;
  padding: 20px;
  border-radius: 8px;
  font-size: .9rem;
  overflow: auto;

  @media (--phone) {
    white-space: pre-wrap;
    word-wrap: break-word;
  }

  code {
    background: none !important;
    color: #ccc;
    margin: 0;
    padding: 0;
    font-size: .9rem;

    .dark-theme & {
      color: inherit;
    }
  }
}

blockquote {
  border-left: 2px solid;
  margin: 40px;
  padding: 10px 20px;

  @media (--phone) {
    margin: 10px;
    padding: 10px;
  }

  &:before {
    content: '”';
    font-family: Georgia, serif;
    font-size: 3.875rem;
    position: absolute;
    left: -40px;
    top: -20px;
  }

  p:first-of-type {
    margin-top: 0;
  }

  p:last-of-type {
    margin-bottom: 0;
  }
}

table {
  table-layout: fixed;
  border-collapse: collapse;
  width: 100%;
  margin: 40px 0;
  border-radius: 5px;
}

table, th, td {
  border: 1px solid;
  padding: 10px;
}

th {
  background: var(--light-background-secondary);

  .dark-theme & {
    background: var(--dark-background-secondary);
  }
}

ul, ol {
  margin-left: 40px;
  padding: 0;

  @media (--phone) {
    margin-left: 20px;
  }
}

ol ol {
  list-style-type: lower-alpha;
}

.container {
  display: flex;
  flex-direction: column;
  justify-content: center;
  text-align: center;
}

.content {
  display: flex;
  flex-direction: column;
  flex: 1 auto;
  align-items: center;
  justify-content: center;
  margin: 50px 0;

  @media (--phone) {
    margin-top: 0;
  }
}

hr {
  width: 100%;
  border: none;
  background: var(--light-border-color);
  height: 1px;

  .dark-theme & {
    background: var(--dark-border-color);
  }
}

.hidden {
  display: none;
}