CSS: Change color on hover

So I have been working on a website with clickable images, but I can't seem to get the ...:hover right. I want that the picture gets overlayed by white color with 0.1 opacity.

<html>
<head>
    <style>
        body {padding: 0; margin: 0;}
        img {
            margin-top: -10px;
            width: 100%;
            height: auto;
        }
        a:hover {
            background-color: rgba(255, 255, 255, 0.1);
        }
        #asca:hover {background-color: rgba(255, 255, 255, 0.1);}
        #fhca:hover {background-color: rgba(255, 255, 255, 0.1);}
        #asca img:hover {background-color: rgba(255, 255, 255, 0.1);}
        #fhca img:hover {background-color: rgba(255, 255, 255, 0.1);}
    </style>
</head>
<body>
    <a id="asca" href="asc.php">
        <img src="Pictures/chevcorvette4kp.png" width="4096" height="900"  alt="ascpic">
    </a>
    <a id="fhca" href="fhc.php">
        <img src="Pictures/fhyper.png" width="4096" height="900"  alt="fhcpic"> 
    </a>
</body>
</html>

As you can see I really tried to change everything to that color upon hover, but it doesn't seem to work.