index.css

* {
    margin: 0;
    padding: 0;
}

body {
    font-family: "Acme";
    height: 95vh;
    background: url('https://cdn.pixabay.com/photo/2019/09/17/09/45/to-do-4483048_960_720.jpg') 
    center/cover
    no-repeat;
}

.h1 {
    font-family: 'Acme';
    margin-top: 10px;
    text-align: center;
    font-size: 70px;
}

.p {
    font-size: 27px;
    margin-left: 30px;
    margin-right: 30px;
}

a,li {
    text-decoration: none;
    list-style: none;
}

.container {
    position: relative;
    top: 10vh;
    max-width: 300px;
    margin: auto;
}

#enter {
    border: none;
    padding: 5px 15px;
    border-radius: 3px;
    color: #04a1bf;
    transition: all 0.5s ease;
    width: 50px;
    height: 50px;
}

#enter:hover{
    background: #04a1bf;
    color: white;
    cursor: pointer;
}

ul {
    margin-top: 20px;

}

li {
    padding: 10px 20px;
    color: #111;
    text-transform: uppercase;
    font-weight: 700;
    border: 2px solid #04a1bf;
    border-radius: 3px;
    margin-bottom: 10px;
    transition: all 0.5s ease;
    letter-spacing: 2px;
    margin-left: -40px;
    background-color: mediumaquamarine;
    margin-right: 11px;
}

li:hover{
    background: #264247;
    color: white;
}

li > button {
    font-weight: normal;
    background: none;
    border: none;
    float: right;
    color: #264247;
    font-weight: 900;
    outline: none;
}

li:hover > button{
    color: #fff;
    cursor: pointer;
}

input {
    border-radius: 3px;
    max-width: 100%;
    padding: 5px;
    border: none;
    outline: none;
    width: 7cm;
    height: 1cm;
    margin-left: -40px;
}

.done {
    color: #666;
    text-decoration-line: line-through;
}

.delete {
    transform: scale(0);
}