*{
    margin:0;
    padding:0;
    box-sizing:border-box;
    font-family:Arial,sans-serif;
}

body{
    background:#0f172a;
    color:#fff;
    display:flex;
    justify-content:center;
    align-items:center;
    height:100vh;
}

.container{
    width:90%;
    max-width:400px;
    background:#1e293b;
    padding:25px;
    border-radius:15px;
    text-align:center;
    box-shadow:0 0 15px rgba(0,0,0,.3);
}

h1{
    margin-bottom:10px;
}

p{
    color:#cbd5e1;
    margin-bottom:20px;
}

button{
    width:100%;
    padding:14px;
    border:none;
    border-radius:10px;
    background:#3b82f6;
    color:#fff;
    font-size:16px;
    cursor:pointer;
}

button:hover{
    background:#2563eb;
}