html,
body {
  margin: 0;
  padding: 0;
  background: #1b1b1b;
  color: whitesmoke;
  font-family: "Roboto", sans-serif;
  height: 100%;
  overflow: hidden;
}

.title {
  -webkit-text-fill-color: transparent;
  -webkit-text-stroke-width: 3px;
  -webkit-text-stroke-color: whitesmoke;
  position: absolute;
  margin: 0.2em 0 0 0;
  width: 100%;
  text-align: center;
  font-size: 4em;
  text-transform: full-width;
}

.simulation-window {
  height: 100%;
  width: 100%;
}

.panel {
  position: absolute;
  bottom: 0;
  margin: 0 5em;
  padding: 5em 0 1em 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  opacity: 20%;
  transition: 500ms ease-in-out;
}
.panel:hover {
  opacity: unset;
}
.panel__buttons {
  margin-top: 1em;
}
.panel__buttons > * {
  min-width: 10em;
}
.panel__buttons > *:not(:first-child) {
  margin-left: 1em;
}

button {
  color: #fff;
  background: #2c3e50;
  padding: 0.5em 2em;
  border: none;
  border-radius: 1em;
  transition: 250ms;
}
button:hover {
  background: #1abc9c;
}
button:active {
  transform: scale(0.9);
}

.settings {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
}
.settings > * {
  flex-basis: 30%;
}

.slider {
  width: 20em;
}
.slider__label {
  display: block;
}
.slider__input {
  -webkit-appearance: none;
  width: calc(100% - (73px));
  height: 10px;
  border-radius: 5px;
  background: #d7dcdf;
  outline: none;
  padding: 0;
  margin: 0;
}
.slider__input::-webkit-slider-thumb {
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #2c3e50;
  cursor: pointer;
  transition: background 0.15s ease-in-out;
}
.slider__input::-webkit-slider-thumb:hover {
  background: #1abc9c;
}
.slider__input:active::-webkit-slider-thumb {
  background: #1abc9c;
}
.slider__input::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border: 0;
  border-radius: 50%;
  background: #2c3e50;
  cursor: pointer;
  transition: background 0.15s ease-in-out;
}
.slider__input::-moz-range-thumb:hover {
  background: #1abc9c;
}
.slider__input:active::-moz-range-thumb {
  background: #1abc9c;
}
.slider__input:focus::-webkit-slider-thumb {
  box-shadow: 0 0 0 3px #fff, 0 0 0 6px #1abc9c;
}
.slider__value {
  display: inline-block;
  box-sizing: border-box;
  position: relative;
  width: 60px;
  color: #fff;
  line-height: 20px;
  text-align: center;
  border-radius: 3px;
  background: #2c3e50;
  padding: 5px 10px;
  margin-left: 8px;
}
.slider__value:after {
  position: absolute;
  top: 8px;
  left: -7px;
  width: 0;
  height: 0;
  border-top: 7px solid transparent;
  border-right: 7px solid #2c3e50;
  border-bottom: 7px solid transparent;
  content: "";
}

::-moz-range-track {
  background: #d7dcdf;
  border: 0;
}

input::-moz-focus-inner,
input::-moz-focus-outer {
  border: 0;
}