index.css

*{
    box-sizing: border-box;
}
body{
    margin: 0;
    background-color: aqua;
    padding: 72px;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}
h1{
    text-align: center;
}
button{
    cursor: pointer;
}
section#edit-container{
    display: flex;
    pad: 32px 120px;
}
section#edit-container input{
    background-color: rgba(128, 128, 128, 0.5);
    border: none;
    outline: none;
    font-size: 20px;
    padding: 3px 8px;
    width: 50%;
    color: white;
}

section#edit-container button{
    padding: 12px 52px;
    margin-left: 16px;
    border: none;
    background-color: blue;
    color: white;
}

section#list-container ul{
    list-style-type: none;
    padding: 0;
    max-height: 75vh;
    overflow-y: auto;
}
section#list-container ul li{
    background-color: white;
    padding: 8px;
    margin-top: 5px;
    width: 75%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
section#list-container ul li button.del-btn{
    background-color: red;
    color: white;
    border: none;
    outline: none;
    padding: 12px;
}