How can I align the text in the button to the bottom?

I tried to set `line-height` and `vertical-align: bottom;` in my CSS but neither worked.

**UPDATE:**

Also, I want the text to be **in front** of the background. I have set back gradients in the `normal`, `hover` and `active` states, so I my white text to be in front of that.

Code:

```css
.img-panel {
  position: relative;
  height: 300px;
  width: 100%;
  background-size: cover;
  color: white;
}

.img-panel:after {
  content: "";
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  position: absolute;
  background: -webkit-gradient(linear, 50% 0%, 50% 100%, color-stop(0%, rgba(0, 0, 0, 0)), color-stop(40%, rgba(0, 0, 0, 0)), color-stop(100%, #000000));
  background: -moz-linear-gradient(top, rgba(0, 0, 0, 0) 0%, rgba(0, 0, 0, 0) 40%, #000000 100%);
  background: -webkit-linear-gradient(top, rgba(0, 0, 0, 0) 0%, rgba(0, 0, 0, 0) 40%, #000000 100%);
  background: linear-gradient(to bottom, rgba(0, 0, 0, 0) 0%, rgba(0, 0, 0, 0) 40%, #000000 100%);
}

.img-panel:hover:after {
  background: -webkit-gradient(linear, 50% 0%, 50% 100%, color-stop(0%, rgba(0, 0, 0, 0.3)), color-stop(40%, rgba(0, 0, 0, 0.3)), color-stop(100%, #000000));
  background: -moz-linear-gradient(top, rgba(0, 0, 0, 0.3) 0%, rgba(0, 0, 0, 0.3) 40%, #000000 100%);
  background: -webkit-linear-gradient(top, rgba(0, 0, 0, 0.3) 0%, rgba(0, 0, 0, 0.3) 40%, #000000 100%);
  background: linear-gradient(to bottom, rgba(0, 0, 0, 0.3) 0%, rgba(0, 0, 0, 0.3) 40%, #000000 100%);
}

.img-panel:active:after {
  background: -webkit-gradient(linear, 50% 0%, 50% 100%, color-stop(0%, rgba(0, 0, 0, 0.6)), color-stop(40%, rgba(0, 0, 0, 0.6)), color-stop(100%, #000000));
  background: -moz-linear-gradient(top, rgba(0, 0, 0, 0.6) 0%, rgba(0, 0, 0, 0.6) 40%, #000000 100%);
  background: -webkit-linear-gradient(top, rgba(0, 0, 0, 0.6) 0%, rgba(0, 0, 0, 0.6) 40%, #000000 100%);
  background: linear-gradient(to bottom, rgba(0, 0, 0, 0.6) 0%, rgba(0, 0, 0, 0.6) 40%, #000000 100%);
}
```

```html
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" integrity="sha384-1q8mTJOASx8j1Au+a5WDVnPi2lkFfwwEAa8hDDdjZlpLegxhjVME1fgjWPGmkzs7" crossorigin="anonymous">
<div class="row">
  <div class="col-md-4 img-panel-container">
    <button class="img-panel translucent-overlay-light" style="background-image: url('http://placeimg.com/500/300/any')">
      Hello
    </button>
  </div>
</div>
```

*For some reason bootstrap is not working in the code snippet*