:root {
  --btn-width: 150px;
  --btn-height: 75px;
  --first-btn-squeeze: 0.9;
  --deep-blue: #101048;
  --orange: #f29e04;
  --swamp: #239702;
  --deep-purple: #6f0397;
  --inactive-blue: #1a647d;
  --active-blue: #3fc6f4;
  --red: #d20404;
  --light-orange: #fff1c5;
  --yellow: #ffef02;
  --hot-pink: #ff0563;
  --default: 0.5s;
  --fast: 0.3s;
  --fastest: 0.2s;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  text-decoration: none;
  user-select: none;
}

html {
  font-size: 10px;
}

html, body {
  display: block;
  position: relative;
  width: 100%;
  height: 100%;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
}

.button-container {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 50%;
  width: 50%;
  min-height: 200px;
  overflow: hidden;
}
.button-container:first-of-type {
  background-color: var(--deep-blue);
}
.button-container:nth-of-type(2) {
  background-color: var(--orange);
}
.button-container:nth-of-type(3) {
  background-color: var(--swamp);
}
.button-container:nth-of-type(4) {
  background-color: var(--deep-purple);
}
@media screen and (max-width: 650px) {
  .button-container {
    width: 100%;
  }
}

.button {
  display: flex;
  justify-content: center;
  align-items: center;
  height: var(--btn-height);
  width: var(--btn-width);
  font-size: 1.6rem;
  color: black;
  cursor: pointer;
}
.button--glow {
  border-radius: 40px;
  font-size: 2rem;
  font-weight: bold;
  font-family: "Nixie One", monospace;
  transition-property: box-shadow, background-color, transform;
  transition-duration: var(--default);
  background-color: var(--inactive-blue);
  box-shadow: none;
}
.button--glow:hover {
  background-color: var(--active-blue);
  box-shadow: 0px 0px 7px 7px white;
}
.button--glow:active {
  background-color: white;
  transform: scale(var(--first-btn-squeeze));
  box-shadow: 0px 0px 30px 30px cyan;
}
.button--block {
  font-family: "Graduate", sans-serif;
  transform: translate3d(-15px, -15px, 0);
  transition-property: box-shadow, transform;
  transition-duration: var(--fast);
  color: var(--red);
  border: 3px solid var(--red);
  background-color: var(--light-orange);
  box-shadow: 15px 15px 5px 0px black;
}
.button--block:active {
  transform: translate3d(-5px, -5px, 0);
  box-shadow: 5px 5px 0px 0px black;
}
.button--gooey {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  transition-property: letter-spacing, background-color, font-size;
  transition-duration: var(--default);
  letter-spacing: auto;
  color: var(--swamp);
  font-family: "Creepster", serif;
  font-size: 4rem;
  background-color: var(--yellow);
}
.button--gooey::before {
  content: "";
  position: absolute;
  left: 0;
  top: -10%;
  height: 120%;
  width: 0;
  border-radius: 100%;
  transform: translate3d(0, 0, 0);
  transition-property: transform, width;
  transition-duration: 0.3s;
  background-color: var(--swamp);
  box-shadow: var(--btn-width) 0px 0px 0px var(--swamp);
}
.button--gooey::after {
  content: "";
  position: absolute;
  left: -10%;
  top: 0;
  height: 0;
  width: 120%;
  border-radius: 100%;
  transform: translate3d(0, 0, 0);
  transition-property: transform, height;
  transition-duration: 0.3s;
  background-color: var(--swamp);
  box-shadow: 0px var(--btn-height) 0px 0px var(--swamp);
}
.button--gooey:active {
  letter-spacing: -2.5px;
  font-size: 3rem;
}
.button--gooey:active::before {
  transform: translate3d(-10px, 0, 0);
  width: 20px;
}
.button--gooey:active::after {
  transform: translate3d(0, -10px, 0);
  height: 20px;
}
.button--future {
  position: relative;
  transition-property: box-shadow, background-color;
  transition-duration: var(--fastest);
  font-family: "Orbitron", monospace;
  box-shadow: inset 0px 0px 0px black;
}
.button--future::before {
  content: "";
  position: absolute;
  left: -1px;
  bottom: 0;
  height: 100%;
  width: 2px;
  transform: translate3d(-50px, 20px, 0);
  transition-property: box-shadow, transform;
  transition-timing-function: ease-in-out;
  transition-duration: 0.2s;
  box-shadow: 250px -40px 0px 0px black;
  background-color: black;
}
.button--future::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 100%;
  height: 2px;
  transform: translate3d(-50px, 20px, 0);
  transition-property: box-shadow, transform;
  transition-duration: 0.2s;
  transition-timing-function: ease-in-out;
  box-shadow: 100px -115px 0px 0px black;
  background-color: black;
}
.button--future:hover::before {
  transform: translate3d(0, 0, 0);
  box-shadow: var(--btn-width) 0 0px 0px black;
}
.button--future:hover::after {
  transform: translate3d(0, 0, 0);
  box-shadow: 0 calc(var(--btn-height) * -1) 0px 0px black;
}
.button--future:active {
  box-shadow: inset 0px 0px 19px black;
  background-color: var(--hot-pink);
}