Change a:visited link colour in stylesheet

I’ve gone through the style.css file and changed it to the colour I want but in the latest version of Firefox (38.0.5) it still shows as the colour of the body text so you cant actually see the links.

body {
	background:#FFF;
	color: #111;
	font-family: 'Open Sans', Helvetica, sans-serif;
}

a {
	color: #3d48bc;
	text-decoration: none;
}

a:hover, a:visited, a:active {
	color: #3d48bc;
	text-decoration: underline;
}

With this in the child theme styles.css:

a:visited {
	color: #3d48bc;
}
.entry a {
	color:#3d48bc;
}
.post a.read-more {
    color:#3d48bc;
}

Any ideas?