html {
    overflow: clip;
    font-family: "PerfectDos";
    text-align: center;
    height: 100%;
    font-size: 20px;
    }
body {
    background-color: #00a;
    color: #f1f1f1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: inherit;
}
h1 {
    background-color: silver;
    color: #00a;
    padding: 0 1rem;
    font-size: 1rem;
    margin: 2em;
}
p {
    margin: 0;
}
#crt-overlay {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none;
    background-image: linear-gradient(0deg, rgba(0,0,0,0) 25%, rgba(0,0,0,0.33) 25%, rgba(0,0,0,0.33) 50%, rgba(0,0,0,0) 50%, rgba(0,0,0,0) 75%, rgba(0,0,0,0.33) 75%, rgba(0,0,0,0.33) 100%);
    background-size: 4px 4px;
}
#crt-overlay::before {
    content: '';
    display: block;
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none;
    background-image: radial-gradient(ellipse at center, rgba(0,0,0,0) 50%, rgba(0,0,0,0.25) 100%);
}