body {
    font-family: Arial, sans-serif;
    background-color: #f0f8ff; /* AliceBlue */
    margin: 0;
    padding: 0;
}

header {
    background-color: #5075A9; /* MediumBlue */
    color: #ffffff;
    padding: 10px 0;
    text-align: center;
}

form {
    max-width: 500px;
    margin: 50px auto;
    padding: 20px;
    background-color: #ffffff;
    border: 1px solid #add8e6; /* LightBlue */
    border-radius: 4px;
    box-shadow: 0 0 10px rgba(0, 0, 255, 0.1); /* Blue with 10% opacity */
}

form h3 {
    color: #5075A9; /* MediumBlue */
    font-size: 24px;
    margin-bottom: 20px;
    text-align: center;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

input[type="text"], input[type="email"], input[type="password"] {
    width: 100%;
    padding: 10px;
    margin-bottom: 20px;
    border: 1px solid #add8e6; /* LightBlue */
    border-radius: 4px;
    box-sizing: border-box;
}

input[type="submit"] {
    width: 100%;
    padding: 10px;
    border: none;
    background-color: #5075A9; /* MediumBlue */
    color: #ffffff;
    cursor: pointer;
}

input[type="submit"]:hover {
    background-color: #5075A9; /* DarkBlue */
}