How to make this CSS hamburger menu fully accessible?

Question

I am working on a menu icon for a CSS hamburger while it works great, except that line spacing is not available. How can I change this code so that the whole button is pressed, not just the lines?

<a href="#" title="Open Menu" class="menu"></a>

.menu {
    width:30px;
    height:5px;
    background-color:#000;
    position:relative;
    display:inline-block;
}
    .menu:after, .menu:before {
        content: '';
        width: 100%;
        height:5px;
        background-color:#000;
        position:absolute;
    }
    .menu:after {
        top:10px;
        left:0;
    }
    .menu:before {
        top:20px;
        left:0;
    }

Here's the JSFiddle .

Thank!

Answer 1

Just do it

DEMO - 1 (upper or lower bound)

.menu {
    width:30px;
    height:20px;
    position:relative;
    display:inline-block;
    border-top:4px solid black;
}
	.menu:after, .menu:before {
	    content: '';
	    width: 100%;
	    height:4px;
	    background-color:#000;
	    position:absolute;
	}
	.menu:after {
	    bottom:0px;
	    left:0;
	}
	.menu:before {
	    top:6px;
	    left:0;
	}

<a href="#" title="Open Menu" class="menu"></a>

Run codeHide result

DEMO -2 (box-shadow)

.menu {
    width:30px;
    height:20px;
    position:relative;
    display:inline-block;
    box-shadow:inset 0 4px 0 black;
}
	.menu:after, .menu:before {
	    content: '';
	    width: 100%;
	    height:4px;
	    background-color:#000;
	    position:absolute;
	}
	.menu:after {
	    bottom:0px;
	    left:0;
	}
	.menu:before {
	    top:8px;
	    left:0;
	}

<a href="#" title="Open Menu" class="menu"></a>

Run codeHide result

DEMO - 3 (only: before or after the mixed insert as a shadow)

.menu {
    width:30px;
    height:20px;
    position:relative;
    display:inline-block;
    box-shadow:inset 0 4px 0 black,inset 0 -4px 0 black;
}
	.menu:after{
	    content: '';
	    width: 100%;
	    height:4px;
	    background-color:#000;
	    position:absolute;
        top:8px;
	    left:0;
	}

<a href="#" title="Open Menu" class="menu"></a>

Run codeHide result

DEMO - 4

.menu {
    width:30px;
    height:14px;
    position:relative;
    display:inline-block;
    border-top: 4px solid black;
    border-bottom: 4px solid black;
}
	.menu:after{
	    content: '';
	    width: 100%;
	    height:4px;
	    background-color:#000;
	    position:absolute;
        top:5px;
	    left:0;
	}

<a href="#" title="Open Menu" class="menu"></a>

Run codeHide result

DEMO - 5 (using background image)

.menu {
width: 30px;
height: 26px;
position: relative;
display: inline-block;
background-size: 10px 10px;
background-image: -webkit-linear-gradient(rgba(0, 0, 0, 1) 50%, transparent 50%, transparent);
background-image: -moz-linear-gradient(rgba(0, 0, 0, 1) 50%, transparent 50%, transparent);
background-image: linear-gradient(rgba(0, 0, 0, 1) 50%, transparent 50%, transparent);
}

<a href="#" title="Open Menu" class="menu"></a>

Run codeHide result