How can I make background half visible when I press the button?-CodePudding

How can I make half of the screen partially black when I click on button, like on the picture :

I made mobile navigation like that and specified that background color should be white:

.nav-links-row-mobile{
    display: none;
    top:0;
    position: absolute;
    left:0;
    list-style: none;
    background-color: #ffffff;
    margin: 0;
    padding: 50px;
    height: 100%;
}

 <div >
                    
                    <ul >
                        <div >
                            <a href="index.html">
                            <h1>Brit</h1><span >lex</span>
                        </a>
                        </div>
                        <li><a href="#!">Home</a></li>
                        <li><a href="#!">Skills</a></li>
                        <li><a href="#!">About Us</a></li>
                        <li><a href="#!">Pricing</a></li>
                        <li><a href="#!">Contacts</a></li>
                    </ul>
                </div>

But how can I make 2nd half of the screen half black or partially visible?

Thank you in advance!

CodePudding user response：

Try giving it a box-shadow with a zero blur, a very large spread and use rgba() to make the shadow color transparent.

body {
  width: 100%;
  height: 100%;
  background: url(https://www.fillmurray.com/800/600) no-repeat center center fixed;
  background-size: cover;
}

.nav-links-row-mobile{
  top:0;
  position: absolute;
  left:0;
  list-style: none;
  background: #ffffff;
  margin: 0;
  padding: 50px;
  height: 100%;
  box-shadow: 0 0 0px 5000px rgba(0,0,0,0.5);
}

<body>
<div >    
    <ul >
        <div >
            <a href="index.html">
            <h1>Brit</h1><span >lex</span>
        </a>
        </div>
        <li><a href="#!">Home</a></li>
        <li><a href="#!">Skills</a></li>
        <li><a href="#!">About Us</a></li>
        <li><a href="#!">Pricing</a></li>
        <li><a href="#!">Contacts</a></li>
    </ul>
</div>
</body>