style.css

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body{
    background-image: linear-gradient(120deg, #d8bb5b, #e6917a);
    color:white;
    font-family: "poppins",sans-serif;
    min-height: 100vh;


}
header{
    font-size: 1.5rem;
}
header, form{
    min-height: 20vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

form input,form button{
    padding: 0.5rem;
    font-size: 2rem;
    border: none;
        background: rgb(255, 255, 255);

}

form button{
    color:#e6917a ;
    background: white;
    cursor: pointer;
    transition: all 0.3s ease;
}
form button:hover{
    background:#e6917a;
    color: white;
}
.todo-container{
    display: flex;
    justify-content: center;
    align-items: center;

}
.todo-list{
    min-width: 30%;
    list-style: none;
}
.todo{
    margin: 00.5rem;
    background: white;
    color:rgb(68, 57, 231);
    font-size: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.5s ease;
}
.todo li{
    flex: 1;
    width: 50%;
}
.trash-btn,.complete-btn{
    background: #ff6f47;
    color: white;
    border: none;
    padding: 0.5rem;
    cursor: pointer;
    font-size: 1rem;
}
.complete-btn{
    background: #26a9d1;
}
.todo-item{
    padding: 0rem 0.5rem;
}
.fa-trash,.fa-check{
    pointer-events: none;
}
.completed{
    text-decoration: line-through;
    opacity: 0.5;
}
.fall{
    transform: translateY(8rem) rotateZ(20deg);
    opacity: 0;
}

select{
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    outline:none;
    border:none;
}

.select{
    margin:1rem;
    position: relative;
    overflow:hidden;
}
select{
    color:#ff6f47;
    width:10rem;
    cursor: pointer;
    padding: 1rem;
}

.select::after{
    content:"\25BC";
    position: absolute;
    background: #ff6f47;
    top:0;
    right:0;
    padding:1rem;
    pointer-events:none;
    transition: all 0.3s ease;

}

.select:hover::after{
    background: white;
    color: #ff6f47;
}