a380.css

*,
*::after,
*::before {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 62.5%;
}

body {
  --light: hsl(220, 50%, 90%);
  --primary: hsl(255, 30%, 55%);
  --focus: hsl(210, 90%, 50%);
  --border-color: hsla(0, 0%, 100%, .2);
  --global-background: hsl(220, 25%, 10%);
  --background: linear-gradient(to right, hsl(210, 30%, 20%), hsl(255, 30%, 25%));
  --shadow-1: hsla(236, 50%, 50%, .3);
  --shadow-2: hsla(236, 50%, 50%, .4);

  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Open Sans', sans-serif;
  color: var(--light);
  background: var(--global-background);
}

a,
a:link {
  font-family: inherit;
  text-decoration: none;
}

a:focus {
  outline: none;
}

button::-moz-focus-inner {
  border: 0;
}


.box {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100vh;
  padding: 0 4rem 2rem;
}

.box:not(:first-child) {
  height: 45rem;
}

.box__title {
  font-size: 10rem;
  font-weight: normal;
  letter-spacing: .8rem;
  margin-bottom: 2.6rem;
}

.box__title::first-letter {
  color: var(--primary);
}

.box__p,
.box__info,
.box__note {
  font-size: 1.6rem;
}

.box__info {
  margin-top: 6rem;
}

.box__note {
  line-height: 2;
}


.modal-container {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 10;

  display: none;
  justify-content: center;
  align-items: center;

  width: 100%;
  height: 100%;

  background: var(--m-background);
}

.modal-container:target {
  display: flex;
}

.modal__image{
    height: 600px;
    width: 600px;
    position: absolute;
    top: calc(50% - 10%);
    right: 7%;
}

.modal {
  width: 60rem;
  padding: 4rem 2rem;
  border-radius: .8rem;

  color: var(--light);
  background: var(--background);
  box-shadow: var(--m-shadow, .4rem .4rem 10.2rem .2rem) var(--shadow-1);
  position: relative;

  overflow: hidden;
}

.modal__title {
  font-size: 3.2rem;
  padding: 1rem;
}

.modal__subtitle {
    
  margin-top: 4rem;
  padding: 1rem;
  font-size: 2.8rem;
  line-height: 2;
}

.modal__subhead {
  margin-top: 4rem;
  padding: 0.35rem;
  font-size: 3rem;
  line-height: 0;
}

.modal__text {
  padding: 0 4rem;
  margin-top: 4rem;

  font-size: 1.6rem;
  line-height: 2;
}

.modal__btn {
  margin-top: 4rem;
  padding: 1rem 1.6rem;
  border: 1px solid var(--border-color);
  border-radius: 100rem;

  color: inherit;
  background: transparent;
  font-size: 1.4rem;
  font-family: inherit;
  letter-spacing: .2rem;

  transition: .2s;
  cursor: pointer;
}

.modal__btn:nth-of-type(1) {
  margin-right: 1rem;
}

.modal__btn:hover,
.modal__btn:focus {
  background: var(--focus);
  border-color: var(--focus);
  transform: translateY(-.2rem);
}


.link-1 {
  font-size: 1.8rem;

  color: var(--light);
  background: var(--background);
  box-shadow: .4rem .4rem 2.4rem .2rem var(--shadow-1);
  border-radius: 100rem;
  padding: 1.4rem 3.2rem;

  transition: .2s;
}

.link-1:hover,
.link-1:focus {
  transform: translateY(-.2rem);
  box-shadow: 0 0 4.4rem .2rem var(--shadow-2);
}

.link-1:focus {
  box-shadow:
    0 0 4.4rem .2rem var(--shadow-2),
    0 0 0 .4rem var(--global-background),
    0 0 0 .5rem var(--focus);
}

.link-2 {
  width: 4rem;
  height: 4rem;
  border: 1px solid var(--border-color);
  border-radius: 100rem;

  color: inherit;
  font-size: 2.2rem;

  position: absolute;
  top: 2rem;
  right: 2rem;

  display: flex;
  justify-content: center;
  align-items: center;

  transition: .2s;
}

.link-2::before {
  content: '×';

  transform: translateY(-.1rem);
}

.link-2:hover,
.link-2:focus {
  background: var(--focus);
  border-color: var(--focus);
  transform: translateY(-.2rem);
}

.abs-site-link {
  position: fixed;
  bottom: 20px;
  left: 20px;
  color: hsla(0, 0%, 1000%, .6);
  font-size: 1.6rem;
}

#aSide {
  height: 600px;
  width: 600px;
  position: absolute;
  top: calc(225% - 1%);
  right: 7%;
}

#aSide model-viewer {
  height: 600px;
  width: 600px;
  position: absolute;
  top: 0;
  left: 0;
  border: none;
}