body{
    font-family: Arial, sans-serif;
    background:#f4f4f4;
}

.contenedor{
    width:500px;
    margin:auto;
    margin-top:50px;
    background:white;
    padding:20px;
    border-radius:10px;
    box-shadow:0px 0px 10px gray;
}

h1{
    text-align:center;
    background:#1f4e79;
    color:white;
    padding:15px;
}

a{
    display:block;
    background:#3498db;
    color:white;
    text-decoration:none;
    padding:12px;
    margin:10px 0;
    text-align:center;
    border-radius:5px;
}

a:hover{
    background:#2980b9;
}