body {
    margin: 0;
    font-family: Arial, sans-serif;
    text-align: center;
    color: white;

    /* YouTube logo background */
    background: url('https://upload.wikimedia.org/wikipedia/commons/b/b8/YouTube_Logo_2017.svg') no-repeat center center fixed;
    background-size: 300px;
    background-color: #000;
}

/* Dark overlay for readability */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.8);
    z-index: -1;
}

header {
    padding: 30px;
}

.main {
    padding: 20px;
}

input {
    width: 80%;
    max-width: 400px;
    padding: 10px;
    border-radius: 8px;
    border: none;
}

button {
    margin-top: 10px;
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    background: red;
    color: white;
    font-weight: bold;
    cursor: pointer;
}

button:hover {
    background: darkred;
}

#thumb {
    margin-top: 20px;
    width: 90%;
    max-width: 500px;
    border-radius: 10px;
}

.hidden {
    display: none;
}

footer {
    margin-top: 40px;
}