skeleton.css

/* Some sane resets. */
html {
  height: 100%;
}

body {
  margin: 0;
  min-height: 100%;
}

/* All the flexbox magic! */
body,
.sb-announcement,
.sb-content,
.sb-main,
.sb-container,
.sb-container__inner,
.sb-article-container,
.sb-footer-content,
.sb-header,
.sb-header-secondary,
.sb-footer {
  display: flex;
}

/* These order things vertically */
body,
.sb-main,
.sb-article-container {
  flex-direction: column;
}

/* Put elements in the center */
.sb-header,
.sb-header-secondary,
.sb-container,
.sb-content,
.sb-footer,
.sb-footer-content {
  justify-content: center;
}
/* Put elements at the ends */
.sb-article-container {
  justify-content: space-between;
}

/* These elements grow. */
.sb-main,
.sb-content,
.sb-container,
article {
  flex-grow: 1;
}

/* Because padding making this wider is not fun */
article {
  box-sizing: border-box;
}

/* The announcements element should never be wider than the page. */
.sb-announcement {
  max-width: 100%;
}

.sb-sidebar-primary,
.sb-sidebar-secondary {
  flex-shrink: 0;
  width: 17rem;
}

.sb-announcement__inner {
  justify-content: center;

  box-sizing: border-box;
  height: 3rem;

  overflow-x: auto;
  white-space: nowrap;
}

/* Sidebars, with checkbox-based toggle */
.sb-sidebar-primary,
.sb-sidebar-secondary {
  position: fixed;
  height: 100%;
  top: 0;
}

.sb-sidebar-primary {
  left: -17rem;
  transition: left 250ms ease-in-out;
}
.sb-sidebar-secondary {
  right: -17rem;
  transition: right 250ms ease-in-out;
}

.sb-sidebar-toggle {
  display: none;
}
.sb-sidebar-overlay {
  position: fixed;
  top: 0;
  width: 0;
  height: 0;

  transition: width 0ms ease 250ms, height 0ms ease 250ms, opacity 250ms ease;

  opacity: 0;
  background-color: rgba(0, 0, 0, 0.54);
}

#sb-sidebar-toggle--primary:checked
  ~ .sb-sidebar-overlay[for="sb-sidebar-toggle--primary"],
#sb-sidebar-toggle--secondary:checked
  ~ .sb-sidebar-overlay[for="sb-sidebar-toggle--secondary"] {
  width: 100%;
  height: 100%;
  opacity: 1;
  transition: width 0ms ease, height 0ms ease, opacity 250ms ease;
}

#sb-sidebar-toggle--primary:checked ~ .sb-container .sb-sidebar-primary {
  left: 0;
}
#sb-sidebar-toggle--secondary:checked ~ .sb-container .sb-sidebar-secondary {
  right: 0;
}

/* Full-width mode */
.drop-secondary-sidebar-for-full-width-content
  .hide-when-secondary-sidebar-shown {
  display: none !important;
}
.drop-secondary-sidebar-for-full-width-content .sb-sidebar-secondary {
  display: none !important;
}

/* Mobile views */
.sb-page-width {
  width: 100%;
}

.sb-article-container,
.sb-footer-content__inner,
.drop-secondary-sidebar-for-full-width-content .sb-article,
.drop-secondary-sidebar-for-full-width-content .match-content-width {
  width: 100vw;
}

.sb-article,
.match-content-width {
  padding: 0 1rem;
  box-sizing: border-box;
}

@media (min-width: 32rem) {
  .sb-article,
  .match-content-width {
    padding: 0 2rem;
  }
}

/* Tablet views */
@media (min-width: 42rem) {
  .sb-article-container {
    width: auto;
  }
  .sb-footer-content__inner,
  .drop-secondary-sidebar-for-full-width-content .sb-article,
  .drop-secondary-sidebar-for-full-width-content .match-content-width {
    width: 42rem;
  }
  .sb-article,
  .match-content-width {
    width: 42rem;
  }
}
@media (min-width: 46rem) {
  .sb-footer-content__inner,
  .drop-secondary-sidebar-for-full-width-content .sb-article,
  .drop-secondary-sidebar-for-full-width-content .match-content-width {
    width: 46rem;
  }
  .sb-article,
  .match-content-width {
    width: 46rem;
  }
}
@media (min-width: 50rem) {
  .sb-footer-content__inner,
  .drop-secondary-sidebar-for-full-width-content .sb-article,
  .drop-secondary-sidebar-for-full-width-content .match-content-width {
    width: 50rem;
  }
  .sb-article,
  .match-content-width {
    width: 50rem;
  }
}

/* Tablet views */
@media (min-width: 59rem) {
  .sb-sidebar-secondary {
    position: static;
  }
  .hide-when-secondary-sidebar-shown {
    display: none !important;
  }
  .sb-footer-content__inner,
  .drop-secondary-sidebar-for-full-width-content .sb-article,
  .drop-secondary-sidebar-for-full-width-content .match-content-width {
    width: 59rem;
  }
  .sb-article,
  .match-content-width {
    width: 42rem;
  }
}
@media (min-width: 63rem) {
  .sb-footer-content__inner,
  .drop-secondary-sidebar-for-full-width-content .sb-article,
  .drop-secondary-sidebar-for-full-width-content .match-content-width {
    width: 63rem;
  }
  .sb-article,
  .match-content-width {
    width: 46rem;
  }
}
@media (min-width: 67rem) {
  .sb-footer-content__inner,
  .drop-secondary-sidebar-for-full-width-content .sb-article,
  .drop-secondary-sidebar-for-full-width-content .match-content-width {
    width: 67rem;
  }
  .sb-article,
  .match-content-width {
    width: 50rem;
  }
}

/* Desktop views */
@media (min-width: 76rem) {
  .sb-sidebar-primary {
    position: static;
  }
  .hide-when-primary-sidebar-shown {
    display: none !important;
  }
  .sb-footer-content__inner,
  .drop-secondary-sidebar-for-full-width-content .sb-article,
  .drop-secondary-sidebar-for-full-width-content .match-content-width {
    width: 59rem;
  }
  .sb-article,
  .match-content-width {
    width: 42rem;
  }
}

/* Full desktop views */
@media (min-width: 80rem) {
  .sb-article,
  .match-content-width {
    width: 46rem;
  }
  .sb-footer-content__inner,
  .drop-secondary-sidebar-for-full-width-content .sb-article,
  .drop-secondary-sidebar-for-full-width-content .match-content-width {
    width: 63rem;
  }
}

@media (min-width: 84rem) {
  .sb-article,
  .match-content-width {
    width: 50rem;
  }
  .sb-footer-content__inner,
  .drop-secondary-sidebar-for-full-width-content .sb-article,
  .drop-secondary-sidebar-for-full-width-content .match-content-width {
    width: 67rem;
  }
}

@media (min-width: 88rem) {
  .sb-footer-content__inner,
  .drop-secondary-sidebar-for-full-width-content .sb-article,
  .drop-secondary-sidebar-for-full-width-content .match-content-width {
    width: 67rem;
  }
  .sb-page-width {
    width: 88rem;
  }
}