.a {
    background-color: #ffebcd;
    padding: 20px 30px;
    color: #b62222;
    text-align: center;
}

.a::after {
    content: "";
    display: table;
    clear: both;
}

#myInput {
    width: 70%;
    padding: 15px;
    float: left;
    font-size: 14px;
    margin: 0;
    border: 2px solid;
}

#myButton {
    padding: 15px;
    width: 25%;
    color: #d87093;
    float: left;
    text-align: center;
    cursor: pointer;

}

ul {
    margin: 0;
    padding: 0;
}

ul li {
    cursor: pointer;
    color: #0f5050;
    text-align: justify;
    padding: 12px 8px 12px 40px;
    background: #87ceeb;
    font-size: 18px;
    list-style-type: none;
}

ul li:nth-child(odd) {
    background-color: #5286a5;
}

ul li.checked {
    background: #00ff7f;
    color: #fff;
    text-decoration: line-through;
}

ul li:hover {
    background-color: lightpink;
}