html {    
    background: url('./image.png') no-repeat center fixed;     
    background-size: cover;
}

.container {
    border: 5px;
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    width: 30%;
    height: 100px;
    margin: auto;
    background-color: #f3f3f3;
}

#temperature {
    padding-top: 10px;
}