hacks-guide-minimal-mistakes-theme/assets/_scss/_sidebar.scss

/* ==========================================================================
   SIDEBAR
   ========================================================================== */

/*
   Default
   ========================================================================== */

.sidebar {
  @include clearfix();
  margin-bottom: 1em;
  @include breakpoint($large) {
    @include span(2 of 12);
    @include suffix(0.25 of 12);
  }
  @include breakpoint($x-large) {
    padding-right: 0;
  }
  h2, h3, h4, h5, h6 {
    margin-bottom: 0;
    font-family: $sans-serif-narrow;
  }
  p, li {
    font-size: 14px;
  }
  img {
    width: 100%;
  }
}

.sidebar__right {
  @include breakpoint($medium) {
    position: absolute;
    top: 0;
    right: 1em;
    width: $right-sidebar-width-narrow;
    padding-left: 2em;
    @include breakpoint($large) {
      width: $right-sidebar-width;
    }
    @include breakpoint($x-large) {
      width: $right-sidebar-width-wide;
    }
  }
  @include breakpoint($large) {
    right: calc(50% - (0.5 * #{$large}) + 1em); // 50% - 1/2 of wrapper's max-width + wrapper padding
  }
  @include breakpoint($x-large) {
    right: calc(50% - (0.5 * #{$x-large}) + 1em); // 50% - 1/2 of wrapper's max-width + wrapper padding
  }
}

/*
   Author profile and links
   ========================================================================== */

.author__avatar {
  display: table-cell;
  vertical-align: top;
  width: 36px;
  height: 36px;
  @include breakpoint($large) {
    display: block;
    width: 100%;
    height: 100%;
  }
  img {
    max-width: 110px;
    border-radius: 50%;
  }
}

.author__content {
  display: table-cell;
  vertical-align: top;
  vertical-align: top;
  padding-left: 15px;
  padding-right: 15px;
  line-height: 1;
  @include breakpoint($large) {
    display: block;
    width: 100%;
    padding-left: 0;
    padding-right: 0;
  }
}

.author__name {
  margin: 0;
  font-size: 18px;
  @include breakpoint($large) {
    margin-top: 10px;
    margin-bottom: 10px;
    font-size: 20px;
  }
}
.sidebar .author__name {
  font-family: $sans-serif;
}

.author__bio {
  margin-bottom: 10px;
  font-size: 14px;
  font-style: italic;
  @include breakpoint($large) {
    margin-bottom: 20px;
  }
}

.author__urls-wrapper {
  position: relative;
  display: table-cell;
  vertical-align: middle;
  font-family: $sans-serif;
  z-index: 9999;
  position: relative;
  cursor: pointer;
  @include breakpoint($large) {
    display: block;
  }
  .btn {
    margin: 0;
    padding: 5px 10px;
    color: mix(#fff, $gray, 25%);
    @include breakpoint($large) {
      display: none;
    }
  }
}

.author__urls {
  display: none;
  position: absolute;
  right: 0;
  margin-top: 15px;
  padding: 10px;
  list-style-type: none;
  border: 1px solid $border-color;
  border-radius: $border-radius;
  background: #fff;
  z-index: -1;
  box-shadow: 0 0 10px rgba(#000, 0.25);
  @include breakpoint($large) {
    display: block;
    position: relative;
    margin: 0;
    padding: 0;
    border: 0;
    background: transparent;
    box-shadow: none;
  }
  &:before {
    content: "";
    position: absolute;
    border-style: solid;
    border-width: 0 10px 10px;
    border-color: $border-color transparent;
    display: block;
    width: 0;
    z-index: 0;
    top: -11px;
    left: calc(50% - 10px);
    @include breakpoint($large) {
      display: none;
    }
  }
  &:after {
    content: "";
    position: absolute;
    border-style: solid;
    border-width: 0 10px 10px;
    border-color: #fff transparent;
    display: block;
    width: 0;
    z-index: 1;
    top: -10px;
    left: calc(50% - 10px);
    @include breakpoint($large) {
      display: none;
    }
  }
  a {
    display: block;
    margin-bottom: 5px;
    padding-right: 5px;
    font-size: 14px;
    text-decoration: none;
    white-space: nowrap;
    &:hover {
      text-decoration: underline;
    }
  }
}