style.css

html, body {
    margin:0;
    padding:0;
    width: 100%;
    overflow: auto;
    font-family: Franklin Gothic Medium,Franklin Gothic,ITC Franklin Gothic,Arial,sans-serif; }

.header {
    overflow: hidden;
    position: relative;
    display: inline-block;
    height: 30vh;
    width: 100%;
    z-index: -1;
    background-image: url("img/bgNEW.jpg");
    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;
}


.date {
    position: absolute;
    font-size: 2em;    
    margin: 2.5em 1em 0 0;
    padding: 0 5px;
    right: 0;
    top: 0;
    border-bottom: 1px solid black;
    border-radius: 10px;
}

.main {
    position: relative;
    width: 100%;
    height: 75vh;
    border-radius: 40px 40px 0 0;
    margin: -40px 0 0 0;
    background-color: white;
    z-index: 1;
}

.list {
    position: relative;
    width: 60vw;
    margin: auto;
    text-align: center;
}


hr {
    color: black;
    width: 80%;
    height: 1px;

}

button {
    display: inline-block;
    padding: .55em 1em;
    font-size: 1em;
    color: white;
    border-radius: 0 10px 10px 0;
    background-color: darkslateblue;
    text-decoration: none;
    border: none;
    transform: translateX(-5px);
    transition: .2s;
}

button:hover {
    background-color: rgb(40, 33, 85);
}

ul {
    margin: 0;
    padding: 0;
}

ul li {
    cursor: pointer;
    position: relative;
    padding: 1em;
    margin: 0 0 .5em 0;
    background: rgb(130, 141, 201);
    transition: .2s;
    user-select: none;
    border-radius: 10px;
    text-align: left;
    list-style: none;
}

ul li:hover {
    background: rgb(73, 44, 153);
}

ul li.checked {
    background: rgb(47, 18, 95);
    text-decoration: line-through;
    color: white;
}


.close {
    position: absolute;
    right: 0;
    top: 0;
    padding: 1em;
    cursor: pointer;
}

#task {
    width: 70%;
    padding: .5em;
    font-size: 1em;
    margin: 2.5em auto 1.5em;
    border-radius: 10px 0 0 10px;
    border: 1px solid darkslateblue;
}

#today {
    width: 50%;
    margin: 0 auto;
    padding: 1em 0 .5em;
    border-bottom: 1px solid black;
    border-radius: 10px;
}