body{
    background:#0f172a;
    color:white;
    text-align:center;
    font-family:Arial;
}
.container{
    margin-top:100px;
}
input{
    padding:10px;
    width:300px;
}
button{
    padding:10px 20px;
    background:green;
    border:none;
    color:white;
}