HTML+CSS. How do I place a horizontal line atop a button?

Tag: css,html5

I am an iOS and 3D dev taking on some Web dev work. In HTML/CSS/JS I have found it impossible to do something that I assumed was trivial: place a horizontal line atop a button.

Here is my button with a background image:

<button id="myButton" style="background-image: url(assets/cursor-filter-thumbnail.png);" class="igv-filter-button" data-toggle="modal" data-target="#myDataTarget">
</button>

Here is the CSS:

.igv-filter-button {
    position: absolute;
    width: 128px;
    border:none;
    padding: 0;
    height: 100%;
    background: none;
}

Now I want to place a horizontal line atop this button that I will programmatically move up/down using JS. Can someone place enlighten me?

Best How To :

1) put a container around your button as shown here

<span class='linestyle'>
<button id="myButton" style="background-image: url(assets/cursor-filter-  
thumbnail.png);" class="igv-filter-button" data-toggle="modal"   
data-target="#myDataTarget">
</button>
<span>

2) Add a css style border-top to your span container

 .linestyle { border-top:1px solid black;}

3) add padding top to your button.

.igv-filter-button    { padding-top:1px;}

4) programmatically adjust the padding for the button.

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