:root{
    --c1: #333;
    --c2: #111;
}
*{
    margin: 0;
    padding: 0;
}
body{
    font-family: sans-serif;
    background-color: var(--c1);
}
main{
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}
h1{
    color: white;
    text-align: center;
    font-size: 9vw;
    line-height: 1.5;
    animation: shadow 1000s infinite;
}
.o1{
    animation: flicker 100s linear 20s infinite;
}
.o2{
    animation: flicker 100s linear 12s infinite;
}
.o3{
    animation: flicker 100s linear 0s infinite;
}
.o4{
    animation: flicker 100s linear 25s infinite;
}
@keyframes flicker{
    0%{color: white;}
    99.6%{color: white;}
    99.7%{color: var(--c1);}
    99.8%{color: white;}
    99.9%{color: var(--c1);}
    100%{color: white;}
}
@keyframes shadow{
    0%{text-shadow: 0 0 0 var(--c2);}
    100%{text-shadow: 0 0 1000px var(--c2);}
}
/* What part of, "Nothing to see here, move along", don't you understand? */