.container_404 {
    width: 320px;
    height: 300px;
    position: absolute;
    top: 25%;
    left: 0;
    right: 0;
    margin: auto;
}

.container_404 h3 {
    font-size: 10vw;
    font-weight: 800;
    text-align: center;
}

.container_404 h4 {
    font-size: 4vw;
    font-weight: 300;
    text-align: center;
    margin-top: 30px;
}

.container_404 hr {
    width: 100%;
    height: 2px;
    border: none;
    outline: none;
}

:root[data-theme="dark"] .container_404 hr {
    background: #FFFFFF;
    box-shadow: 
    0 0 20px #E6B800,   /* Subtle inner glow */
    0 0 40px #E6B800;   /* Larger outer glow */
}

:root[data-theme="light"] .container_404 hr {
    background: #000000;
    box-shadow: 
    0 0 20px #E6B800,   /* Subtle inner glow */
    0 0 40px #E6B800;   /* Larger outer glow */
}