style.css

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

/* body */
body {
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    background : url('img/background.jpg');
    font-family: monospace;
    font-size: 0.8rem;
    text-align: center;
}
/*linear-gradient(to right, #00c6ff, #0072ff);*/
/* #map */
/* this is mandatory */
#map-div {
    width: 800px;
    height: 350px;
    box-shadow: 7px -2px 8px -1px rgba(0, 0, 0, 0.7);
    border-top-right-radius: 3px;
    border-top-left-radius: 3px;
}

/* #details */
#details {
    background-color: #2d2e36;
    padding: 10px;
    color: #fff;
    display: flex;
    width: 800px;
    max-width: 800px;
    box-shadow: 7px -2px 8px -1px rgba(0, 0, 0, 0.7);
    border-bottom-right-radius: 3px;
    border-bottom-left-radius: 3px;
}

/* all div inside #details */
#details div {
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

/* all span */
span {
    font-size: 1rem;
    margin-top: 10px;
}