html {  
    width: 100%; 
    height: 100%;
}
body {  
    margin: 0; 
    padding: 0; 
    background: #323337; 
    background-image:  url(background.jpg);
    background-size:   cover;
    background-repeat: no-repeat;
    background-position: center center;
}
.box {
    position: absolute;
    width: 450px;
    height: 150px;
    left: 50%;
    top: 50%;
    border-radius: 16px;
    transform: translate(-50%, -50%);
    background-color: rgb(23,28,45) !important;
    background-color: rgba(23,28,45,0.75) !important;
    padding: 20px;
    font-family: Arial,Helvetica,sans-serif;
    font-size: 14px;
    color: #dedede;
    text-align: center;
    font-weight: bold;
}
.box h1{
    font-family: Arial,Helvetica,sans-serif;
    font-size: 20px;
    color: #dddddd;
    text-align: center;
    font-weight: bold;
}
.box p{
    font-family: Arial,Helvetica,sans-serif;
    font-size: 14px;
    color: #dedede;
    text-align: center;
    font-weight: normal;
}