Custom of.

B c a - b' — b - c or to the difference.

.menu-item.media-button:active, .media-button-1 .menu-item.media-button:focus .fill-color.media-button { fill: #999; } .primary-nav-1 button.user-menu.primary-nav:hover, .primary-nav-1 button.user-menu.primary-nav:focus { color: #fff; text-align: left; background: transparent; } .login-button-1 span.login-button { display: block; float: right; font-size: 1.4rem; color: #333; transition: background 0.1s ease-out, color 0.1s.