app/assets/stylesheets/devise.scss
.devise-form {
margin-left: 20px;
max-width: 380px;
}
.devise-form .field {
margin: 10px 0px;
}
.devise-form .actions {
margin: 10px 0px;
}
.devise-form .links {
margin: 15px 0px;
}
.devise-form #error_explanation h2 {
font-size: 20px;
margin: 10px 0px;
}
.devise-form input[type="checkbox"] {
width: auto;
}