styles.css

.todo {
    width: 100%;
    margin: 0;
    height: 100%;
    padding: 1em;
    background: #fbfbfb;
    font-family: "Lucida Sans Unicode", "Lucida Grande", sans-serif;
    font-size: 0.8em;
    color: #444452;
    overflow-y: scroll;
}

.todo  h1 {
    margin: 0;
    font-weight: bold;
}

.todo input[type="text"] {
    width: 100%;
    height: 3em;
    line-height: 3em;
    padding: 1em;
    margin: 10px 0px 10px 0px;
    border-radius: 11px;
    border: none;
    box-shadow: 0px 0px 6px #d0d0d0 inset;
}

.todo .username {
    font-weight: 700;
}

.todo .signOut {
    text-decoration: underline;
}

.todo .hideDone {
    float: right;
}

.todo ul {
    list-style: none;
    margin: 0;
    padding: 0;
    flex-wrap: wrap;
}

.todo ul li {
    margin: 3px 0px 0px 0px;
    display: flex;
    align-items: center;
    padding: 10px;
    border-bottom: 1px solid gray;
}

.todo ul li button {
    background: #b1b1b1;
    color: #fbfbfb;
    border: none;
    height: 100%;
    padding: 5px;
    cursor: pointer;
}

.todo ul li button:hover {
    background: #d65d7f;
}

.todo ul .completed .text {
    text-decoration: line-through;
    color: #afafaf;
}

.todo ul li .text {
    flex-grow: 1;
    margin: 0px 10px 0px 10px;
}