body{
    margin:0;
    height:100vh;
    display:flex;
    justify-content:center;
    align-items:center;
    background:#f4f7fb;
    font-family:Arial,sans-serif;
}

.login-box{
    background:white;
    width:350px;
    padding:30px;
    border-radius:12px;
    box-shadow:0 0 15px rgba(0,0,0,.15);
}

input{
    width:100%;
    box-sizing:border-box;
    padding:12px;
    margin-bottom:10px;
}

button{
    width:100%;
    padding:12px;
    border:none;
    background:#1e88e5;
    color:white;
    cursor:pointer;
}

.error{
    color:red;
}