*{
    box-sizing: border-box;
    font-family:'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
}
body{
    background:
        linear-gradient(red, transparent),
        linear-gradient(to top left, lime, transparent),
        linear-gradient(to top right, blue, transparent);
    background-blend-mode: screen;
    font-family: 'Arvo', serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content:center;
    height: 100vh;
    margin: 0;
}
h1{
    color: rgb(0, 0, 0);
    font-size: 9rem;
    text-align: center;
    opacity: 0.7;
}
form{
    box-shadow: 0 4px 10px #0d2b06;
    max-width: 100%;
    width: 400px;
}
.input{
    border: none;
    color: rgb(21, 24, 21);
    font-size: 1rem;
    padding: 1rem 2rem;
    display: block;
    width:100%;
}

input::placeholder{
    color: rgb(138, 130, 121);
}
.todos{
    background-color: #fff;
    padding:0;
    margin:0;
    list-style-type: none;
}
.todos li{
    border-top: 1px solid gray;
    cursor: pointer;
    font-size: 1.2rem;
    padding: 1rem 2rem;
}
.todos li.completed{
    color: rgb(255, 60, 60);
    text-decoration: line-through;
}
small{
    color: rgb(36, 51, 63);
    margin-top: 3rem;
    text-align: center;
    font-size: 1rem;
}