standardnotes-app-web/app/assets/stylesheets/_main.scss

$z-index-editor-content: 10;

$z-index-editor-title-bar: 100;
$z-index-dropdown-menu: 1002;

$z-index-resizer-overlay: 1000;
$z-index-panel-resizer: 1001;

$z-index-component-view: 1000;

$z-index-footer-bar: 2000;
$z-index-footer-bar-item: 2000;
$z-index-footer-bar-item-panel: 2000;

$z-index-preferences: 3000;

$z-index-purchase-flow: 4000;

$z-index-lock-screen: 10000;
$z-index-modal: 10000;

html {
  font-size: 100%;
}

body {
  font-size: var(--sn-stylekit-base-font-size);
}

html,
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu',
    'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
  -moz-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-font-smoothing: antialiased;
  min-height: 100%;
  height: 100%;
  line-height: normal;
  margin: 0;
  color: var(--sn-stylekit-foreground-color);
  background-color: var(--sn-stylekit-background-color);
}

* {
  box-sizing: border-box;
}

.uppercase {
  text-transform: uppercase;
}

.tinted {
  color: var(--sn-stylekit-info-color);
}

.tinted-selected {
  color: var(--sn-stylekit-info-contrast-color);
}

h1 {
  font-size: var(--sn-stylekit-font-size-h1);
}

h2 {
  font-size: var(--sn-stylekit-font-size-h2);
}

h3 {
  font-size: var(--sn-stylekit-font-size-h3);
}

input,
button,
select,
textarea {
  font-family: inherit;
  font-size: inherit;
  line-height: normal;
}

a {
  text-decoration: none;

  &.no-decoration {
    color: inherit;
  }

  &:hover {
    text-decoration: underline;

    &.no-decoration {
      text-decoration: none;
    }
  }
}

::selection {
  background: var(--sn-stylekit-info-color) !important; /* WebKit/Blink Browsers */
  color: var(--sn-stylekit-info-contrast-color);
}

::-moz-selection {
  background: var(--sn-stylekit-info-color) !important;
  color: var(--sn-stylekit-info-contrast-color);
}

p {
  color: var(--sn-stylekit-paragraph-text-color);
  margin: 0;
}

.main-ui-view {
  min-height: 100vh;
  height: 100vh;
  position: relative;
  overflow: auto;
  background-color: var(--sn-stylekit-background-color);
}

$footer-height: 2rem;

#resizer-overlay {
  position: absolute;
  width: 100%;
  height: 100%;
  background-color: transparent;
  z-index: $z-index-resizer-overlay;
  opacity: 0;
}

.app {
  height: calc(100% - #{$footer-height});
  overflow: hidden;
  position: relative;
  vertical-align: top;
  width: 100%;

  panel-resizer,
  .panel-resizer {
    top: 0;
    right: 0;
    z-index: $z-index-panel-resizer;
    width: 4px;
    height: 100%;
    position: absolute;
    cursor: col-resize;
    // needs to be a color that works on main bg and contrast bg
    background-color: var(--sn-stylekit-secondary-contrast-background-color);
    opacity: 0;
    border-top: none;
    border-bottom: none;

    @keyframes fade {
      0% {
        opacity: 0;
      }

      50% {
        opacity: 1;
      }

      100% {
        opacity: 0;
      }
    }

    &.left {
      left: 0;
      right: none;
    }

    &.always-visible {
      opacity: 1;
    }

    &.collapsed {
      opacity: 1;
      // so it blends in with editor a bit more
      // background-color: var(--sn-stylekit-editor-background-color);
    }

    &.dragging {
      opacity: 1;
    }

    &.animate-opacity {
      animation-duration: 1.6s;
      animation-name: fade;
      animation-delay: 0.25s;
    }

    &.hoverable {
      &:hover {
        opacity: 1;
      }
    }
  }

  .section {
    padding-bottom: 0px;
    height: 100%;
    max-height: calc(100vh - #{$footer-height});
    position: relative;
    overflow: hidden;

    > .content {
      height: 100%;
      max-height: 100%;
      background-color: var(--sn-stylekit-background-color);
      position: relative;
    }

    .section-title-bar {
      .add-button {
        font-size: 12px;
      }

      .section-title-bar-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        // This was causing problems with tags + button cutting off on right when the panel is a certain size
        // overflow: hidden;

        > .title {
          white-space: nowrap;
          text-overflow: ellipsis;
          width: 80%;
          overflow: hidden;
        }
      }
    }
  }
}

.icon {
  margin-right: 4px;
}

.z-index-preferences {
  z-index: $z-index-preferences;
}

.z-index-purchase-flow {
  z-index: $z-index-purchase-flow;
}

textarea {
  &.non-interactive {
    user-select: text !important;
    resize: none;
    background-color: transparent;
    border-color: var(--sn-stylekit-border-color);
    font-family: monospace;
    outline: 0;

    -webkit-user-select: none;
    -webkit-touch-callout: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    -o-user-select: none;
  }
}