body {
    background-color:lightblur;
}
h1 {
    color:red;
    text-align:center;
}
header {
    background:linear-gradient(90deg,#4CAF50,#45a04g);
    color:white;padding:30px 0;
    text-align:center;
    box-shadow: 4px 10px rgba(0,0,0,0.1);
}
header h1{
    font-size:2.5rem;
    margin-bottom:10px;
}