dat.gui/elements/number-controller.css

:host {
  display: block;
  text-select: none;
  font-size: 0;
  height: 100%;
}
#track-container {
  height: 100%;
  width: 100%;
  height: 30px;
}
#track {
  width: 100%;
  height: 1px;
  -webkit-border-radius: 1px;
  border-radius: 1px;
  display: inline-block;
  position: relative;
  background: rgba(0,0,0,0.1);
}
#fill {
  height: 1px;
  margin-top: 0px;
  margin-left: 1px;
  -webkit-border-radius: 1px;
  border-radius: 1px;
  position: absolute;
  background: #fff;
  pointer-events: none;
}
#knob {
  width: 6px;
  height: 6px;
  margin-left: -3px;
  margin-top: -3px;
  -webkit-transition: -webkit-transform 0.2s cubic-bezier(0.25, 0.25, 0, 1);
  -moz-transition: -moz-transform 0.2s cubic-bezier(0.25, 0.25, 0, 1);
  -o-transition: -o-transform 0.2s cubic-bezier(0.25, 0.25, 0, 1);
  -ms-transition: -ms-transform 0.2s cubic-bezier(0.25, 0.25, 0, 1);
  transition: transform 0.2s cubic-bezier(0.25, 0.25, 0, 1);
  pointer-events: none;
  position: absolute;
  background-color: #fff;
  -webkit-border-radius: 100%;
  border-radius: 100%;
}
#track-container:hover #knob {
  -webkit-transform: scale(1.8);
  -moz-transform: scale(1.8);
  -o-transform: scale(1.8);
  -ms-transform: scale(1.8);
  transform: scale(1.8);
}
#track-container:active #knob {
  -webkit-transform: scale(1.4);
  -moz-transform: scale(1.4);
  -o-transform: scale(1.4);
  -ms-transform: scale(1.4);
  transform: scale(1.4);
}
input {
  font: 500 11px 'Roboto', sans-serif;
  color: #fff;
  -webkit-font-smoothing: antialiased;
  height: 30px;
  padding-left: 5px;
  display: inline-block;
  background: transparent;
  border: 0;
  text-align: center;
  outline: none;
  width: 20%;
  -webkit-transition: width 0.2s cubic-bezier(0.25, 0.25, 0, 1);
  -moz-transition: width 0.2s cubic-bezier(0.25, 0.25, 0, 1);
  -o-transition: width 0.2s cubic-bezier(0.25, 0.25, 0, 1);
  -ms-transition: width 0.2s cubic-bezier(0.25, 0.25, 0, 1);
  transition: width 0.2s cubic-bezier(0.25, 0.25, 0, 1);
}
input:hover {
  width: 28%;
}
input:focus {
  width: 50%;
}
input::selection {
  background-color: rgba(0,0,0,0.1);
}