Regarding the choice of class names: you are using using wrapper elements routinely, outside absolute edge cases like border gradients, you don’t have current CSS skills. As mentioned previously current CSS means you can have a 1:1 match of HTML element to UI element for the vast majority of layouts, no wrappers required.
Current gen frameworks will put the styling inside the component so styling is literally a matter of scrolling down.
<div class=“login”>
.login {
padding: 12px 6px;
}