platypush/platypush/backend/http/static/css/source/settings/users.scss

#users {
    ul {
        list-style-type: none;

        li {
            margin: 0;
            padding: 1em .5em;
            border-bottom: $default-border-3;
            cursor: pointer;

            &:hover {
                background: $hover-bg;
            }
        }
    }

    form {
        display: flex;
        flex-direction: column;
        width: 20em;

        input {
            margin: 1em .5em;
        }
    }
}