styles.css

html,
body {
   margin: 0;
   padding: 0;
}
body {
    background: linear-gradient(0deg, #f1e1ff, #20ac6a);
    min-height: 100vh;
    /* overflow-y: hidden; */
    font-family: "Noto Sans TC", sans-serif;
    margin: 0;
    padding: 0;
}
.container {
    position: relative;
    background-color: white;
    width: 400px;
    margin: 100px auto;
    padding: 10px 100px;
    border-radius: 30px;
    z-index: 2;
}
.title {
    position: relative;
    text-align: center;
    font-size: 32px;
    font-weight: 700;
}
.inner-wrapper {
    margin: 0 auto;
    max-width: 450px;
    width: 300px;
}
.input-wrapper {
    border-radius: 20px;
    background: #eeeff0;
    display: flex;
    justify-content: space-between;
    width: 100%;
    max-width: 424px;
}
.input-wrapper input {
    background-color: transparent;
    border: 0;
    flex: 1;
    outline: none;
    padding: 10px 20px;
}
.input-wrapper button {
    background-color: #0a9758;
    border: 0;
    color: white;
    cursor: pointer;
    font-size: 14px;
    font-weight: 700;
    border-radius: 20px;
    padding: 10px 13px;
}
.list{
    list-style: none;
    padding: 0px;
}
.list li{
    vertical-align: middle;
    font-weight: 400;
    padding: 5px;
    position: relative;
}
.list li.checked{
    text-decoration: line-through;
}
.list li::before{
    content: " ";
    display: inline-block;
    width: 20px;
    height: 24px;
    background-image: url('assets/unchecked.svg');
    background-size: contain;
    background-repeat: no-repeat;
    cursor: pointer;
    vertical-align: middle;
    margin-right: 10px;
}
.list li.checked::before{
    background-image: url('assets/checked.svg');
}
.delete{
    background-image: url('assets/delete.svg');
    border-radius: 5px;
    padding: 5px;
    background-position: center;
    background-size: contain;
    object-fit: cover;
    cursor: pointer;
    position: absolute;
    background-repeat: no-repeat;
    right: 0;
    top: 0;
    width: 10px;
    height: 24px;
}
.delete:hover{
    background-color: #f1e1ff;
    cursor: pointer;
}
.clock {
    position: sticky;
    top: 30px;
    height: 120px;
    width: 100%;
    text-align: center;
    vertical-align: middle;
    font-size: 80px;
    font-weight: bold;
    color: white;
    padding: 10px 0;
    z-index: 0;
}