body {
    max-width:1920px;
    min-width: 320px;
}
body * {transition:all 0.5s;}
main {
    width:400px; height:800px;
    margin:50px auto;
    text-align: center;
    padding:100px 20px;
    border: 2px solid #FF7D29;
}
main h1 {
    font-size:3rem; font-weight:700;
    margin-bottom: 50px;
    color:#FF7D29;
}
main .to_do {
    display:flex; justify-content: space-between;
}
main .to_do input {
    font-size:0.75rem;
    color:rgba(25,25,25,0.5);
    width:250px;
    padding:10px 0 10px 20px;
    border-bottom: 1px solid #333;
    background-color: transparent;
}
main .to_do #plus_btn {
    font-size:0.75rem; font-weight:500;
    color:#333; border-radius: 50px;
    border:1px solid #333;
    padding:10px 30px;
}
main .to_do #plus_btn:hover {
    background-color: #FF7D29; color:#fff;
    padding:10px 30px;
    border:1px solid #FF7D29;
    transition:background-color 0.8s ease, color 0.5s ease, border 0.5s ease;
}
main .list {
    margin-top:80px;
    text-align: left;
    padding:0 10px;
}
main .list li {
    display: flex; justify-content: space-between;
    padding:10px 0;
}
main .list li .list_check {
    display: flex; 
}
main .list li .list_check input {margin-right:20px;}
main .list li .list_check span {}
main .list li #close_btn {}



@media screen and (max-width:768px){
    main{
        width:375px;

    }
    main h1 {
        font-size:2rem;
        margin-bottom:67px;
    }
    main .to_do {
        width:300px; margin:0 auto;
    }
    main .to_do input {
        width:200px;
    }
    main .to_do #plus_btn,
    main .to_do #plus_btn:hover {
        padding:10px 20px;
        font-weight:400;
    }
    main .list {
        width:300px; margin:80px auto;
    }
    main .list li .list_check {
        align-items: center;
    }
    main .list li span {
        font-size: 0.75rem;
    }
}