body{
    background-color: aquamarine;
    font-family: Arial, Helvetica, sans-serif;
}
 .box {
    width: 80%;
    max-width: 500px;
    margin: 30px auto;      
    background-color: brown; 
    color: white;
    text-align: center;
    padding: 10px;
    border-radius: 25px;  
 }