styles.css

body {
  font-family: Lucida Console, Monaco5, monospace;
  height: 100vh;
  /* Permalink - use to edit and share this gradient: http://colorzilla.com/gradient-editor/#1b3061+0,192b55+100 */
  background: #1b3061; /* Old browsers */
  background: -moz-linear-gradient(top,  #1b3061 0%, #192b55 100%); /* FF3.6+ */
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#1b3061), color-stop(100%,#192b55)); /* Chrome,Safari4+ */
  background: -webkit-linear-gradient(top,  #1b3061 0%,#192b55 100%); /* Chrome10+,Safari5.1+ */
  background: -o-linear-gradient(top,  #1b3061 0%,#192b55 100%); /* Opera 11.10+ */
  background: -ms-linear-gradient(top,  #1b3061 0%,#192b55 100%); /* IE10+ */
  background: linear-gradient(to bottom,  #1b3061 0%,#192b55 100%); /* W3C */
  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#1b3061', endColorstr='#192b55',GradientType=0 ); /* IE6-9 */
}

.css-root {
  margin: 36px auto 0;
  max-width: 800px;
  min-width: 640px;
  border-radius: 2px;
  border: 3px solid #35769A;
  box-shadow: 0px 0px 10px 1px rgba(53,118,154,0.5), inset 0px 0px 10px 1px rgba(53,118,154,0.5);
  padding: 5px;
}

.css-planet-monitor {
  margin-top: 0;
  border: 5px solid #87AFE7;
  border-radius: 2px;
  box-shadow: 0px 0px 10px 1px rgba(135,175,231,0.5), inset 0px 0px 10px 1px rgba(135,175,231,0.5);
  padding: 16px;
  background-color: #2F5093;
  color: #EDE66A;
  text-shadow: 0px 0px 10px rgba(237, 230, 106, 0.6);
}

.css-scrollable-list {
  display: flex
}

.css-slots {
  flex: 1 80%;
  padding: 0;
  list-style-type: none;
  margin: 0 7px 0 0;
}

.css-slot {
  padding: 16px;
  border: 5px solid hsla(167, 82%, 68%, 1);
  border-radius: 2px;
  box-shadow: 0px 0px 10px 1px rgba(105, 240, 210, 0.45), inset 0px 0px 10px 1px rgba(105, 240, 210, 0.45);
  color: #69F0D2;
  font-size: 18px;
  height: 1.7em;
}

.css-slot h3, .css-slot h4, .css-slot h5, .css-slot h6 {
  margin: 0;
}

.css-slot + .css-slot {
  margin-top: 7px;
}

.css-scroll-buttons {
  flex: 1 20%;
  display: flex;
  flex-direction: column;
}

.css-scroll-buttons button {
  flex: 1;
  border: 5px solid #69F0D2;
  border-radius: 2px;
  box-shadow: 0px 0px 10px 1px #69F0D2, inset 0px 0px 10px 1px #69F0D2;
  background: #39697A;
}

.css-button-down {
  margin-top: 7px;
}

.css-button-up::after {
  content: '\21D1';
  display: block;
  color: #69F0D2;
  font-size: 30px;
  text-shadow: 0px 0px 10px #69F0D2;
}

.css-button-down::after {
  content: '\21D3';
  display: block;
  color: #69F0D2;
  font-size: 30px;
  text-shadow: 0px 0px 10px #69F0D2;
}

.css-button-disabled {
  opacity: 0.5;
}

.css-slot.active {
  color: red;
}