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-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: 32px;

#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});
  width: 100%;
  display: flex;
  vertical-align: top;
  overflow: hidden;
  position: relative;

  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;

    .scrollable {
      overflow-y: auto;
      overflow-x: 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;
}