.error-code {
    font-family: 'IBM Plex Mono', 'Fira Mono', 'Roboto Mono', monospace;
    font-weight: 700;
    font-size: 10rem;
    color: #2c3e50;
    text-shadow:
        0.05em 0 0 rgba(255, 0, 0, 0.75),
        -0.025em -0.05em 0 rgba(0, 255, 0, 0.75),
        0.025em 0.05em 0 rgba(0, 0, 255, 0.75);
    margin: 0;
    line-height: 1;
    letter-spacing: 0.15em;
    position: relative;
    font-variant-numeric: tabular-nums;
    -webkit-font-smoothing: antialiased;
}

.error-code::before {
    content: attr(data-text);
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(255,255,255,0.2);
    clip-path: polygon(0 0, 100% 0, 100% 35%, 0 35%);
    mix-blend-mode: screen;
}

@media (max-width: 768px) {
    .error-code {
        font-size: 6rem;
        letter-spacing: 0.1em;
    }
}