* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html,
body {
    width: 100%;
    height: 100%;
}

body {
    background-image: url("bg1.png");
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
}

/* Light blue overlay */
.overlay {
    width: 100%;
    height: 100vh;

    background: rgba(135, 206, 235, 0.65);

    display: flex;
    justify-content: center;
    align-items: center;
}

/* Center button */
.enter-btn {
    display: inline-block;
    padding: 15px 40px;

    background: #ffffff;
    color: #1677a8;

    text-decoration: none;
    font-family: Arial, sans-serif;
    font-size: 16px;
    font-weight: 600;

    border-radius: 8px;

    transition: all 0.3s ease;
}

.enter-btn:hover {
    background: #1677a8;
    color: #ffffff;
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}