stylus/install-usercss/install-usercss.css

body {
  overflow: hidden;
  display: flex;
  height: 100vh;
}

a {
  color: var(--fg);
  transition: color .5s;
}

a:hover {
  color: var(--c40);
}

img.icon {
  height: 1.4em;
  vertical-align: middle;
}

input:disabled + span {
  color: var(--c50);
}

#header,
.warnings {
  flex: 0 0 var(--header-width);
  box-sizing: border-box;
  padding: 1rem;
  box-shadow: 0 0 50px -18px black;
  word-break: break-all;
  overflow-wrap: break-word;
  overflow-y: auto;
  z-index: 100;
}
#header {
  --child-gap: 1rem;
}
#header-contents > :nth-last-child(n + 2) {
  margin-bottom: var(--child-gap);
}
#header.meta-init-error {
  display: none;
}
#header-contents ul {
  margin: 0;
}

.warnings {
  display: none;
  padding-bottom: 0;
  flex-basis: auto;
  background: #ffe2e2;
  border-right: none;
  border-bottom: 1px dashed var(--c65);
}

.has-warnings .warnings {
  display: flex;
}

.warning {
  font-weight: bold;
  font-size: 125%;
  margin-bottom: 1em;
}

.warning pre {
  overflow-wrap: break-word;
  white-space: pre-wrap;
  margin: 1ex 0 0;
  font-family: monospace;
  font-weight: normal;
  font-size: 80%;
}

h1 {
  margin-top: 0;
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
}
.meta-name {
  margin-right: .5em;
}
.meta-version {
  font-size: 0.6em;
  white-space: nowrap;
}
.meta-version::before {
  content: "v";
}
.checkbox-wrapper {
  padding-left: 16px;
  position: relative;
  box-sizing: border-box;
  display: block;
}
.set-update-url p {
  word-break: break-all;
  opacity: .5;
  margin: .25em 0 0;
}
#install-wrapper {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
}
#install-wrapper > :nth-last-child(n + 2) {
  margin-right: .5rem;
}
#live-reload-install-hint {
  color: darkcyan;
}
.w100 {
  width: 100%;
}

.install {
  background-color: hsl(0, 0%, 33%);
  color: #eee;
  border-radius: 4px;
  padding: 4px 38px 4px 10px;
  position: relative;
  display: inline-block;
  text-shadow: 1px 1px 1px #333;
  -webkit-appearance: none;
  -moz-appearance: none;
  border-style: none;
  cursor: pointer;
  box-shadow: inset 0 -1px 0 0 hsl(0, 0%, 24%), inset 0 1px 0 0 hsl(0, 0%, 30%), inset 1px 0 0 0 hsl(0, 0%, 24%);
  transition: color .25s, background-color .25s;
}

.install,
.install:before {
  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAIAAAAeCAYAAAAGos/EAAAABmJLR0QA/wD/AP+gvaeTAAAACXBIWXMAAAsTAAALEwEAmpwYAAAAB3RJTUUH4gINFiccyZ2qfAAAAB1pVFh0Q29tbWVudAAAAAAAQ3JlYXRlZCB3aXRoIEdJTVBkLmUHAAAAb0lEQVQY012OwQ3CUAzFnNeMAfsv1hk4VDTm0H6ByMmyLL2U+lRowKobwAVFEEWbwqKIIGDXBTQqBU3VbWYk0CTLIAxNEHI1s5oAYXAYm2AIfZ64Ab1ta4s/yHv908twHB5gqf0Tvyg1l9l3efC9Dw0XRC2vHIXXAAAAAElFTkSuQmCC);
  background-size: 100% 100%;
  background-repeat: repeat-x;
}

.install:hover:not(:disabled) {
  background-color: hsl(0, 0%, 38%);
  color: var(--bg);
  text-shadow: none;
}

.install:before,
.install:after {
  content: "";
  vertical-align: middle;
  box-sizing: border-box;
  border-radius: 0 4px 4px 0;
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: 30px;
}

.install:before {
  border-left: 1px solid rgba(0, 0, 0, .3);
  box-shadow: inset 0 -1px 0 0 hsl(0, 0%, 24%), inset 0 1px 0 0 hsl(0, 0%, 30%), inset -1px 0 0 0 hsl(0, 0%, 38%);
  padding: 5px 8px;
  transition: background-color .25s;
}

.install:before,
.install:active:before,
.install:active:hover:before {
  background-color: hsl(176, 50%, 35%);
}

.install:hover:before {
  background-color: hsl(176, 50%, 40%);
}

.install:active,
.install:active:before {
  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAIAAAAeCAYAAAAGos/EAAAABmJLR0QA/wD/AP+gvaeTAAAACXBIWXMAAAsTAAALEwEAmpwYAAAAB3RJTUUH4gINFioX6+ENuQAAAB1pVFh0Q29tbWVudAAAAAAAQ3JlYXRlZCB3aXRoIEdJTVBkLmUHAAAAc0lEQVQY003OwQ0CQQxD0edsRBX03xg9cFjBhMPuSOT0ZdmxuS/zesWTzExBI7xlZhrKeeYkmZkH1Icg3Rfs1D98v3Kgj+NSypJlpZWU0tbKKlpVCm0JSyuxPbbnqpiJ0JLr8+w9sbtGxqRFInvYbLiVGX46ECZMv8VvjwAAAABJRU5ErkJggg==);
  background-size: 100% 100%;
  background-repeat: repeat-x;
}

.install:active,
.install:active:hover {
  background-color: hsl(0, 0%, 33%);
}

.install:after {
  background-image: url(../images/icon/16.png);
  background-repeat: no-repeat;
  background-position: center center;
}

.install:disabled {
  opacity: .25;
  color: white;
  cursor: auto;
}

.install.reinstall:after {
  filter: grayscale(100%);
}

.install.reinstall:before,
.install.reinstall:active:before,
.install.reinstall:active:hover:before {
  background-color: hsl(0, 0%, 20%);
}

.install.reinstall:hover:before {
  background-color: hsl(0, 0%, 25%);
}

.install.reinstall:hover:before {
  background-color: #444;
}

.install.update:before,
.install.update:active:before,
.install.update:active:hover:before {
  background-color: hsl(140, 100%, 13%);
}

.install.update:hover:before {
  background-color: hsl(140, 100%, 18%);
}

.install.update:after {
  filter: hue-rotate(-18deg) brightness(.7) contrast(2);
}

h2 {
  font-weight: bold;
  margin: 0;
  color: darkcyan;
}
.installed .configure-usercss svg {
  fill: hsl(180, 100%, 20%);
}
.installed .configure-usercss:hover svg {
  fill: hsl(180, 100%, 30%);
}

#header-contents > .hide-empty:empty,
body:not(.installed) .install-show,
.installed .install-hide {
  display: none !important;
}
.installed .install-dim {
  opacity: .5;
}

.external {
  text-align: center;
}

.external > * {
  margin: 0 7.5px;
}

li {
  margin-left: -2em;
}

.main {
  overflow: hidden;
}

.main,
.main .CodeMirror {
  height: 100%;
  width: 100%;
  border: none;
}

/* spinner-related */

#header {
  position: relative;
}

#header:not(.meta-init) > *:not(.lds-spinner),
#header.meta-init > .lds-spinner {
  -moz-user-select: none;
  user-select: none;
  pointer-events: none;
  opacity: 0;
}

#header.meta-init > * {
  transition: opacity .5s;
}

.meta-init[data-arrived-fast="true"] > * {
  transition-duration: .1s;
}

.lds-spinner {
  top: 50px;
  opacity: .2;
  transition: opacity .5s;
  animation: none;
}

.configure-usercss .svg-icon.config {
  width: 20px;
  height: 20px;
}
#message-box.config-dialog {
  width: 0;
  height: 0;
  background: none;
}
#message-box.config-dialog > div {
  box-shadow: 5px 5px 50px rgba(0, 0, 0, 0.75); /* copied from message-box.css + darkened the color */
}

/************ reponsive layouts ************/

@media (max-width: 850px) {
  body {
    flex-direction: column;
  }
  #header {
    border-bottom: 1px dashed var(--c65);
    min-height: 6rem;
    max-height: 40vh;
    resize: vertical;
    flex: 0 1 auto;
    --child-gap: .75rem;
  }
  #header:not(.meta-init) {
    min-height: 300px;
  }
  #header-contents {
    display: flex;
    flex-wrap: wrap;
    align-content: flex-start;
    align-items: flex-start;
  }
  #header-contents > :not(.w100) {
    margin-right: 1rem;
  }
  .set-update-url {
    display: flex;
    white-space: nowrap;
    box-sizing: border-box;
  }
  .set-update-url p {
    margin: 0 0 0 1rem;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  .warning:not(:last-child) {
    border-bottom: 1px dashed #b57c7c;
    padding-bottom: 1em;
  }
  #header-contents h3 {
    margin: 0 0 .5rem;
  }
  #message-box.config-dialog > div {
    top: auto;
    bottom: 3rem;
  }
  h1 {
    flex-wrap: nowrap;
  }
  .meta-name {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
  .main {
    height: auto;
    flex: 1;
  }
}

@media (min-width: 850px) {
  #header {
    height: 100% !important; /* overrides user resize */
  }
  .w100-full {
    width: 100%;
    margin-top: var(--child-gap);
  }
}

/* Retina-specific stuff here */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  .install:after {
    background-image: url(../images/icon/32.png);
    background-size: 16px 16px;
  }
}