main.css

html {
  overflow: hidden;
  font-size: 16px;
  box-sizing: border-box;
}

body {
  background-color: #202022;
  color: #f2f2f2;
  display: flex;
  flex-direction: column;
  flex: 1;
  font-family: "Raleway", "Helvetica Neue", "Lucida Grande", Arial, sans-serif;
  height: 100%;
  line-height: 1.5;
  margin: 0;
  overflow: hidden;
  padding: 0;
  position: absolute;
  width: 100%;
}

body:fullscreen {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
  left: 0;
  top: 0;
}

canvas {
  position: absolute;
  z-index: 1;
  width: 100%;
  height: 100%;
}

a {
  color: #ff0;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

button {
  cursor: pointer;
  text-transform: uppercase;
}

a,
button,
input,
select {
  pointer-events: auto;
}

.hide {
  display: none !important;
}

#loading-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 3;
  text-align: center;
  border: 1px solid #062f4f;
  background: rgb(240, 183, 161);
  background: radial-gradient(
    ellipse at center,
    rgba(84, 84, 84, 1) 1%,
    rgba(38, 37, 33, 1) 100%,
    rgba(191, 110, 78, 1) 100%
  );
}

#loading-bar {
  position: absolute;
  left: 50%;
  top: 50%;
  max-width: 70%;
  min-width: 50%;
  transform: translate3d(-50%, -50%, 0);

  border-radius: 60px;
  overflow: hidden;
  background-color: #eef1f3;
}
#loading-bar > span {
  display: block;
}

#bar {
  background-color: #eef1f3;
}

#progress {
  background-color: #75b800;
  padding: 5px;
  color: #fff;
  width: 5px;
}

#file-upload-form {
  position: absolute;
  left: 50%;
  top: 40%;
  width: 90%;
  transform: translate3d(-50%, -50%, 0);
  text-align: center;
  transition: all 1.5s ease-in-out;
}

#file-upload-form > p > a {
  color: purple;
}

.controls {
  display: grid;

  grid-template-areas:
    "tl tr"
    "bl br";
  grid-gap: 1rem;

  position: absolute;
  z-index: 2;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;

  pointer-events: none;
}

.controls a,
.controls span,
.controls input,
.controls select {
  pointer-events: all;

  transition: all 2s ease-in-out;
  color: rgb(66, 66, 66);
}

.controls > div {
  display: flex;
  flex-direction: row;
}

.controls-section-blank {
  grid-area: tl;
  align-items: flex-start;
  justify-content: flex-start;
}
.controls-section-lighting {
  grid-area: tr;
  align-items: flex-start;
  justify-content: flex-end;
}
.controls-section-animation {
  grid-area: bl;
  align-items: flex-end;
  justify-content: flex-start;
  margin-bottom: 1.5rem;
}
.controls-section-misc {
  grid-area: br;
  align-self: flex-end;
  justify-self: end;

  align-items: flex-end;
  justify-content: flex-end;

  width: 10rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.dark-slider {
  box-shadow: none;
  background-color: lightgrey;
}

.light-slider {
  box-shadow: none;
  background-color: black;
}

button {
  border-radius: 3px;
  flex-grow: 1;
}

input,
textarea,
select {
  display: inline-block;
  width: 100%;
  padding: 0.25em;
  margin-bottom: 0.5em;
  color: #f2f2f2;
  background-color: #fff;
  border: 1px solid #ccc;
  border-radius: 4px;
  -webkit-box-shadow: 0 1px 1px rgb(0 0 0 / 13%);
  box-shadow: 0 1px 1px rgb(0 0 0 / 13%);
}

input {
  pointer-events: all;
  transition: all 2s ease-in-out;
  color: #424242;
  margin: 0;
  font-size: 100%;
}

input[type="submit"] {
  transition: all 0.5s ease-in-out;
  max-width: 70%;
  min-width: 50%;
  margin-top: 0.5em;
  white-space: normal;
  cursor: pointer;
  color: white;
  font-size: 24px;
  padding-top: 10px;
  padding-bottom: 10px;
  font-family: "Montserrat", Arial, Helvetica, sans-serif;
  width: 100%;
  background: #062f4f;
  border-radius: 5px;
  border: 0;
  font-weight: 700;
}

input[type="range"] {
  padding: 0;
  margin: 0;
  margin-top: 1em;
  max-width: 12em;
  border: none;
  height: 3px;
  background-size: 0 100%;
  border-radius: 50%;
  cursor: pointer;
  -webkit-appearance: none;
}
input[type="range"]::-webkit-slider-runnable-track {
  box-shadow: none;
  border: none;
  background: transparent;
  -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
  width: 14px;
  height: 14px;
  border: 0;
  background: #545454;
  border-radius: 100%;
  box-shadow: 0 0 1px 0 rgba(0, 0, 0, 0.1);
  -webkit-appearance: none;
}