.box.box--100vw 
  .box__text
    p #[b F]ull width
.box.box--grid 
  .box__text
    p Grid
.box.box--column-left 
  .box__text
    p Non-centered #[b C]olumn
.box.box--column-right 
  .box__text
    p #[b S]idebar
.box.box--gap 
  .box__text
    p #[b G]ap
.box.box--divide.box--divide-left 
  .box__text
    p #[b L]eft #[b O]ffset
.box.box--divide.box--divide-right 
  .box__text
    p #[b R]ight #[b O]ffset
.legend
  .legend__row
    p LO = (F - (C + G + S)) / -2
    p RO = LO + G + S
  .legend__row
    p LO - Left Offset
    p RO - Right Offset
    p F - Full-width (100wv)
    p C - Content (100%)
    p S - Sidebar
    p G - Gap

:root {
  --width-100vw: 100vw;
  --width-grid: 60vw;
  --width-col1: calc(var(--width-grid) * .6);
  --width-col2: calc(var(--width-grid) * .3);
  --width-gap: calc(var(--width-grid) * .1);
}

body {
  min-height: 100vh;
  padding: 0;
  margin: 0;
  position: relative;;
}

.box {
  will-change: true;
  position: absolute;
  top: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin-left: auto;
  margin-right: auto;
  opacity: 0;
  animation-fill-mode: forwards;
  animation-duration: 18s;
  animation-iteration-count: infinite;
}

.box--100vw {
  background-color: #4158D0;
  width: var(--width-100vw);
  left: 50%;
  transform: translateX(-50%);
  animation-name: revealvw;
}

.box--grid {
  background-color: #C850C0;
  width: var(--width-grid);
  left: 50%;
  transform: translateX(-50%);
  animation-name: revealgr;
}

.box--column-left {
  background-color: #00DBDE;
  width: var(--width-col1);
  left: calc((var(--width-100vw) - var(--width-grid)) / 2);
  animation-name: revealcl;
}

.box--column-right {
  background-color: #00DBDE;
  width: var(--width-col2);
  right: calc((var(--width-100vw) - var(--width-grid)) / 2);
  animation-name: revealcr;
}

.box--gap {
  background-color: #85FFBD;
  width: var(--width-gap);
  right: calc(((var(--width-100vw) - var(--width-grid)) / 2) + var(--width-col2));
  animation-name: revealg;
}

.box--divide {
  background-color: #FFCC70;
}

.box--divide-left {
  width: calc((var(--width-100vw) - var(--width-grid)) / 2);
  left: 0;
  animation-name: revealdl;
}

.box--divide-right {
  width: calc(((var(--width-100vw) - var(--width-grid)) / 2) + var(--width-gap) + var(--width-col2));
  right: 0;
  animation-name: revealdr;
}

.box__text {
  text-align: center;
  
  @media screen and (max-width: 600px) {
    writing-mode: vertical-rl;
    transform: rotate(180deg);
  }
}

p {
  margin: 0;
  line-height: 2;
}

.legend {
  background-color: #FFFB7D;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0; 
}

.legend__row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  
  p {
    padding-left: .5em;
    padding-right: .5em;
  }
}

@keyframes revealvw {
  0% {
    opacity: 0;
  }
  2%,
  100% {
    opacity: 1;
  }
}

@keyframes revealgr {
  0%,
  11% {
    opacity: 0;
  }
  13%,
  100% {
    opacity: 1;
  }
}

@keyframes revealcl {
  0%,
  21% {
    opacity: 0;
  }
  23%,
  100% {
    opacity: 1;
  }
}

@keyframes revealcr {
  0%,
  31% {
    opacity: 0;
  }
  33%,
  100% {
    opacity: 1;
  }
}

@keyframes revealg {
  0%,
  41% {
    opacity: 0;
  }
  43%,
  100% {
    opacity: 1;
  }
}

@keyframes revealdl {
  0%,
  51% {
    opacity: 0;
  }
  53%,
  100% {
    opacity: 1;
  }
}

@keyframes revealdr {
  0%,
  61% {
    opacity: 0;
  }
  63%,
  100% {
    opacity: 1;
  }
}