styles.css

@import url('https://fonts.googleapis.com/css2?family=Roboto+Slab&display=swap');

*,
*:after,
*:before{
    padding:0;
    margin:0;
    font-family: 'Roboto Slab', serif;
    font-size: 16px;
    
}

:root{
    --background-color:#DEE1DD;
    --input-color:#2F575D;
    --item-color:#28363D;
}

body{
    background-color: var(--background-color);
}


/* FORM */
form{
    width:fit-content;
    margin:auto;
    margin-top:130px;
}

form input{
    display: block;
    width:800px;
    padding:18px 15px;
    margin-bottom: 20px;
    
    background: var(--input-color);
    color:white;
    box-shadow: 3px 3px 5px rgba(40, 54, 61, 0.5);
    border-radius: 5px;
    border:0;
}

form input::placeholder{
    color:white;
    opacity: .8;
}

form input:focus{
    outline:0;
}

form button{
    display:block;
    padding:15px 60px;
    border-radius: 8px;
    border:0;
    color:white;
    background: var(--input-color);
    cursor:pointer;
}


/* SECTION TO-DO LIST */
section{
    width:fit-content;
    margin:150px auto;
}

section h3{
    font-size: 20px;
}

.list{
    display:flex;
    gap:10px;
    flex-direction: column;
}

.item{
    width:962px;
    background: var(--item-color);
    border-radius:5px;
    padding:20px;
    display:flex;
    align-items: center;
    color:white;
    filter: drop-shadow(10px 5px 61px rgba(0, 0, 0, 0.25));
    max-height: 60px;
    overflow:hidden;
    transition:.5s ease;
    animation: 5s ease;
}

.item-info{
    width: 100%;
    display:flex;
    align-items: center;
    margin-right: 15px;
    transition:.3s ease;
}

.item-info:hover{
    cursor:pointer;
}

.item-info span{
    padding:10px;
    
}

.checked{
    opacity:0.5;
}

.checked::after{
    position:absolute;
    content: "";
    width:85%;
    height:3px;
    background:var(--background-color);
    left:50px;
}

.options{
    display:flex;
    justify-content: space-evenly;
    gap:20px;
}

.options div:hover{
    cursor:pointer;
}