index.css

body {
  background-color: #000;
  color: #fff;

  /* Allow mouse dragging. */
  -moz-user-select: none;
  -ms-user-select: none;
  -o-user-select: none;
  -webkit-user-select: none;
  user-select: none;

  /* disable touch panning/zooming */
  -ms-touch-action: none;
  touch-action: none;

  /* Allow canvas to hit the edges of the browser viewport. */
  margin: 0;
}

#screen canvas {
  margin: auto;

  /* Hide the gap for font descenders. */
  display: block;

  /* disable scaling interpolation */
  image-rendering: optimizeSpeed;
  image-rendering: -moz-crisp-edges;
  image-rendering: -o-crisp-edges;
  image-rendering: -webkit-optimize-contrast;
  image-rendering: optimize-contrast;
  image-rendering: pixelated;
  -ms-interpolation-mode: nearest-neighbor;
}

#screen div.wrapper, #screen .wrapper {
  position: absolute;
  z-index: 2;
}

/* INPUT */
.ui.wrapper.input {
  width: 90%;
  margin-left: auto;
  margin-right: auto;
}

.ui.input, .ui.input > input {
  font-size: 1em;
  width: 90%;
  left: 0;
  right: 0;
  margin-left: auto;
  margin-right: auto;

  max-width: 100%;
  -webkit-box-flex: 1;
  -ms-flex: 1 0 auto;
  flex: 1 0 auto;
  outline: 0;
  -webkit-tap-highlight-color: rgba(255, 255, 255, 0);
  text-align: left;
  line-height: 1.21428571em;
  padding: .67857143em 1em;
  background: #fff;
  border: 1px solid rgba(34, 36, 38, .15);
  color: rgba(0, 0, 0, .87);
  border-radius: .28571429rem;
  transition: border-color .1s ease, -webkit-box-shadow .1s ease;
  transition: box-shadow .1s ease, border-color .1s ease;
  transition: box-shadow .1s ease, border-color .1s ease, -webkit-box-shadow .1s ease;
  box-shadow: none;
}

@media only screen and (max-width: 480px) {
  .ui.input > input {
    width: 60%;
    padding: .5em;
  }
}

.ui.input, .ui.input > input {
  position: relative;
  font-weight: 400;
  font-style: normal;
  display: -webkit-inline-box;
  display: -ms-inline-flexbox;
  display: inline-flex;
  color: rgba(0,0,0,.87);
}

.ui.action.input > .button {
  display: flex;
  align-items: center;
  flex: 0 0 auto;
  border-radius: 0 .28571429rem .28571429rem 0;
  padding-top: .78571429em;
  padding-bottom: .78571429em;
  margin: 0;
}

.ui.action.input > input {
  border-top-right-radius: 0px;
  border-bottom-right-radius: 0px;
  border-right-color: transparent;
}

.ui.action.input > input[disabled] {
  border-top-right-radius: .28571429rem;
  border-bottom-right-radius: .28571429rem;
  border-right-color: rgba(34, 36, 38, .15);
}

.ui.button {
  cursor: pointer;
  display: inline-block;
  min-height: 1em;
  outline: 0;
  border: none;
  vertical-align: baseline;
  background: #e0e1e2 none;
  color: rgba(0,0,0,.6);
  margin: 0 .25em 0 0;
  padding: .78571429em 1.5em .78571429em;
  text-transform: none;
  text-shadow: none;
  font-weight: 700;
  line-height: 1em;
  font-style: normal;
  text-align: center;
  text-decoration: none;
  border-radius: .28571429rem;
  -webkit-box-shadow: 0 0 0 1px transparent inset, 0 0 0 0 rgba(34,36,38,.15) inset;
  box-shadow: 0 0 0 1px transparent inset, 0 0 0 0 rgba(34,36,38,.15) inset;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  -webkit-transition: opacity .1s ease,background-color .1s ease,color .1s ease,background .1s ease,-webkit-box-shadow .1s ease;
  transition: opacity .1s ease,background-color .1s ease,color .1s ease,background .1s ease,-webkit-box-shadow .1s ease;
  transition: opacity .1s ease,background-color .1s ease,color .1s ease,box-shadow .1s ease,background .1s ease;
  transition: opacity .1s ease,background-color .1s ease,color .1s ease,box-shadow .1s ease,background .1s ease,-webkit-box-shadow .1s ease;
  will-change: '';
  -webkit-tap-highlight-color: transparent;
}

/* Disabled */
.ui.input[disabled], .ui.action.input > input[disabled] {
  background: #e0e1e2 none;
}

/**
  SELECT DROPDOWN
**/
/* Reset */
select {
  -webkit-appearance: none;
  -moz-appearance: none;
  -ms-appearance: none;
  appearance: none;
  outline: 0;
  box-shadow: none;
  border: 0 !important;
  background: #2c3e50;
  background-image: none;
}

/* Custom Select */
.select {
  position: relative;
  display: block;
  width: 20em;
  height: 3em;
  line-height: 3;
  background: #2c3e50;
  overflow: hidden;
  border-radius: .25em;

  margin: 0 auto;
}

select {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0 0 0 .5em;
  color: #fff;
  cursor: pointer;
  font-family: Quicksand;
  font-size: 1em;
}

select::-ms-expand {
  display: none;
}

select option:not(:first-child) {
  font-size: 1.2rem;
}

/* Arrow */
.select::after {
  content: '\25BC';
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  padding: 0 1em;
  background: #34495e;
  pointer-events: none;
}

/* Transition */
.select:hover::after {
  color: #f39c12;
}

.select::after {
  -webkit-transition: .25s all ease;
  -o-transition: .25s all ease;
  transition: .25s all ease;
}

.select .active {
  background: #f39c12;
}