index.css

form {
    max-width: 600px;
    margin: auto;
    padding: 20px;
    border: 1px solid #ccc;
    border-radius: 5px;
    }

h1{
    text-align: center;
}
label, input[type="submit"] {
	display: block;
	margin-bottom: 10px;
}

input[type="text"], input[type="email"], input[type="password"], input[type="date"] {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
    box-sizing: border-box;
    font-size: 16px;
    margin-bottom: 10px;
}

input[type="checkbox"]{
    padding: 10px;
    border-radius: 10px;
    box-sizing: border-box;
    margin-bottom: auto;
}


button[type="submit"] {
    background-color: rgb(92, 92, 170);
    border-color:black;
    cursor: pointer;
    color: whitesmoke;
    border: none;
    border-radius: 5px;
    padding: 10px 20px;
    font-size: 16px;
}

button[type="submit"]:hover {
    background-color: yellowgreen;
}

input#name:invalid:focus{
    border:1px solid red;
} 

input#email:invalid:focus{
    border:1px solid red;
}

.error {
    color: red;
    margin-bottom: 10px;
}

.Display{
    display: grid;
}

.mx-auto {
    text-align: center;
    margin-right: auto!important;
    margin-left: auto!important;
}

.align {
    text-align: -webkit-center;
}

.container{

    border: 2px;
    border-radius: 2px;
    border-color: black;
}

.form{
    padding-top: 20px;
}

button {
    display: -webkit-box;
}