body {
 background-color: #212121;
 color: #ffffff;
}

button {
margin-top: 10px;  
}

.header {
 margin-left: 42.5%;
}

.form {
 margin-left: 42.5%;
 align-content: center;
 justify-content: center;
 margin-top: 20%!important; 
}