How to add Master page background Image in ASP .Net

Question

How to add Master page background Image in ASP .Net

body {
           background-image: url(../Images/images1.jpg) no-repeat;
           background-attachment: fixed;
            margin-top: 0px;
 }

this is not working

Answer 1

try this:-

    html { 

        background: url(Jellyfish.jpg) no-repeat center center fixed; 

        background-size: cover;
    }