body {
    margin: 0;
    width: 100%;
    height: 100vh;
    font-family: "Avenir", sans-serif;
    color: #fff;
    background: linear-gradient(-45deg, #5e17a9, #cf41fe, #f4d3ff);
    background-size: 200% 200%;
    animation: gradientBG 10s ease infinite;
}

.container {
    width: 100%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

h1 {
    font-weight: 900;
    font-size: 3em;
}

.logo {
    width: 30em;
    height: auto;
    margin-bottom: 1em;
}

.return-btn {
    display: inline-block;
    background-color: white;
    color: #5e17a9;
    border-radius: 5px;
    padding: 10px 20px;
    text-decoration: none;
    font-family: 'Avenir', sans-serif;
    transition: background-color 0.3s, color 0.3s;
}

.return-btn:hover {
    background-color: #2a0037;
    color: white;
}

@keyframes gradientBG {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}