libredirect/pages/styles.css

:root {
  --text-main: #FFF;
  --text-secondary: #000;
  --dark-grey: #3C4043;
  --white: #FFF;
  --active: #FF5B56;
  --space: 5px;
  --danger: #f04141;
  --danger-light: #F9D0D5;
}

body {
  color: var(--text-secondary);
  margin: 0;
  max-width: 400px;
  min-width: 300px;
  background-color: var(--dark-grey);
}

header {
  background-color: var(--white);
  color: var(--text-secondary);
  display: flex;
  padding: var(--space);
}

header h1 {
  font-size: 2em;
}

header .logo-container {
  margin: var(--space);
}

header .logo-container img {
  max-width: 100%;
}

header small {
  display: block;
  font-size: .70em;
  font-weight: bold;
  margin: 1%;
  width: 100%;
  text-align: right;
}

h1 {
  font-size: 14px;
  margin: var(--space) auto;
}

i {
  font-size: 12px;
}

h2 {
  clear: both;
  font-size: 12px;
  font-weight: normal;
  margin: 0;
}

h3 {
  font-size: 16px;
}

h1,
h2 {
  color: var(--text-main);
}

footer {
  width: 100%;
}

footer a.button {
  margin: var(--space);
}

/* Elements */

input[type=url] {
  width: 100%;
  margin-bottom: 5px;
}

input[type=checkbox] {
  opacity: 0;
}

.checkbox-label {
  background: grey;
  border-radius: 25px;
  color: var(--text-main);
  cursor: pointer;
  display: block;
  float: right;
  font-weight: bold;
  height: 30px;
  position: relative;
  text-indent: -400px;
  width: 50px;
}

.checkbox-label:after {
  background: #fff;
  border-radius: 90px;
  content: '';
  height: 20px;
  left: 5px;
  position: absolute;
  top: 5px;
  transition: 0.3s; /* Acts on transform below */
  width: 20px;
}
input:checked+label {
  background: var(--active);
}
/* position  when active*/
input:checked+label:after {
  left: calc(100% - 5px);
  transform: translateX(-100%);
}

.settings_block {
  display: block;
  padding: 5px 1em 20px 1em;
  border-bottom: var(--dark-grey) solid 1px;
}

.settings_block h1 {
  float: left;
}

.button {
  border: var(--active) solid 1px;
  color: var(--text-main);
  display: block;
  font-size: 12px;
  font-weight: bold;
  margin: var(--space) auto;
  padding: 10px;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  -webkit-transition-duration: 0.4s;
  transition-duration: 0.4s;
}

.button:hover {
  background-color: var(--active);
  color: #fff;
}

.button:active {
  background-color: var(--active);
  box-shadow: 0 5px var(--dark-grey);
  transform: translateY(4px);
}

input[type="url"]:invalid {
  color: var(--danger);
  border-color: var(--danger);
  background-color: var(--danger-light);
}

.margin-bottom {
  margin-bottom: 20px;
}