html,
body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}
canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 997;
}

.intro {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    z-index: 998;
    background: #000;
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    opacity: 1;
    will-change: opacity;
    transition: opacity 1s ease-in-out;
}
.intro h1 {
    padding: 0;
    margin: 0;
}
.intro h2 {
    text-transform: uppercase;
    padding: 0;
    margin: 10px 0 50px 0;
}
.intro__action {
    display: block;
    border: 2px solid #fff;
    color: #fff;
    background-color: transparent;
    padding: 10px 20px;
    border-radius: 3px;
    cursor: pointer;
}
.intro__action:hover,
.intro__action:active {
    background-color: #fff;
    color: #000;
}

.hidden {
    opacity: 0;
    pointer-events: none;
}