ul#todo-list    {
    padding: 0;
}
ul#todo-list li {
    background-color: aquamarine;
    margin-bottom: 4px;
}
ul#todo-list li.work   {
    background-color: aqua;
}
ul#todo-list li.home   {
    background-color: cornflowerblue;
}
ul#todo-list li.social {
    background-color: blue;
}