todo.css

/* ToDo css */

body {
    display: flex;
    justify-content: center;
    font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
}

div#todoList {
    width: 450px;
    height: 400px;
    
    border-style: solid;
    border-color: black;
    border-width: 4px;
    border-radius: 10px;
    display: flex;
    flex-direction: column;
}

div#todoList #title {
    width: 100%;
    height: 40px;
    background-color: orange;
    border-top-left-radius: 6px;
    border-top-right-radius: 6px;
    border-width:4px;
    text-align: center;
    font-size: 16pt;
    font-weight: bold;
    padding-top: 8px;
}

ul#todos {
    list-style-type: none;
    flex-grow: 1;
}

ul#todos li {
    margin-top: 10px;
    cursor: pointer;
}

ul#todos li span.trash { 
    visibility: hidden;
}

ul#todos li:hover span.trash { 
    visibility: visible;
}

ul#todos li input:checked + label {
    text-decoration: line-through;
}

div#add{
    display: flex;
    justify-content: center;
    padding-bottom: 4px;
    padding-left: 6px;
    border-bottom-left-radius: 6px;
    border-bottom-right-radius: 6px;
    padding-top: 4px;
    background-color: orange;

}

input#addInput {
    margin-left: 10px;
}