body {
    margin: 0px;
    overflow: hidden;
}

header {
    text-align: center;
    font-size: 3rem;
    font-style: italic;
    background: blue;
    line-height: 150%;
    color: aliceblue;
    margin-top: 0px;
    width: 100%;
}

footer {
    position: absolute;
    bottom: 0;
    width: 100%;
    margin: 0;
}

div > h3 {
    bottom: auto;
    background: blue;
    text-align: center;
    line-height: 2rem;
    color: aliceblue;
    margin: 0;
}

nav {
    background-color: rgb(100, 143, 222);
    line-height: 30px;
}

ul {
    list-style-type: none;
    display: flex;
    margin: 0px 30px 0px 0px;
    justify-content: end;
    cursor: pointer;
   
}

ul > li {
    margin: 10px;
    font-size: large;
    color: aliceblue;
}

ul > li:hover {
    color: blue;
}

.grid_container {
    display: grid;
    background: aqua;
    padding: 20px;
    grid-template-columns: auto auto auto;
    line-height: 100px;
    overflow-y: scroll;
}

.grid_container > div {
    background: rgb(2, 28, 29);
    border: 1px solid rgb(0, 0, 0);
    line-height: 100%;
    text-align: center;
    font-size: 20px;
    color: white;
}