body{
font-family:Arial;
background:linear-gradient(135deg,#0a2a66,#1e4fa1);
text-align:center;
color:white;
}

.container{
margin-top:100px;
}

#certificate{
background:white;
color:black;
width:900px;
padding:40px;
margin:auto;
border:10px solid gold;
border-radius:10px;
}

button{
padding:10px 20px;
background:#1e4fa1;
color:white;
border:none;
border-radius:6px;
cursor:pointer;
}