body {
    margin: 0;
    font-family: Arial, sans-serif;
    text-align: center;
    color: #fff;
    background: url("drakenverhuur.png") no-repeat center center fixed;
    background-size: cover;
}

header {
    background: #2e008b;
    color: #fff;
    padding: 20px;
    box-shadow: 0 2px 6px rgba(0,0,0,.5);
}

header h1 {
    margin: 0;
    font-size: 1.6rem;
}

.hover-underline {
    font-size: 2rem;
    position: relative;
    display: inline-block;
    color: #ffffff;
}

.hover-underline a {
    color: inherit;
    text-decoration: none;
}

.hover-underline::after,
.hover-underline::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 2px;
    background: linear-gradient(to right, #0015ff, #00ffff);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.hover-underline::after {
    bottom: -5px;
    left: 0;
    transform-origin: right;
}

.hover-underline::before {
    top: -5px;
    left: 0;
    transform-origin: left;
}

.hover-underline:hover::after,
.hover-underline:hover::before {
    transform: scaleX(1);
}


.formulier {
    width: 80%;
    max-width: 500px;
    margin: 40px auto;
    padding: 20px;
    background: rgba(0,0,0,.5);
    border-radius: 10px;
    text-align: left;
}

input, select, textarea {
    width: 100%;
    margin-top: 5px;
    padding: 6px;
    border-radius: 6px;
    border: 1px solid #ccc;
    box-sizing: border-box;
}

input[type="radio"],
input[type="checkbox"] {
    width: auto;
    margin-right: 5px;
}

input[type="submit"] {
    background: #0015ff;
    color: #fff;
    border: none;
    padding: 10px;
    border-radius: 6px;
    cursor: pointer;
}

input[type="submit"]:hover {
    background: #00ffff;
    color: #000;
}

#successMessage {
    color: #00ffae;
    text-align: center;
    margin-top: 10px;
}