I have an image and I put css style `margin-left:-50px` and `margin-right:-50px` but is just collapsing, it should be bigger. 

Is there any alternative way to do this?

Why isn't negative margin on both left and right working properly?

Code:

```
<img class="myslide" src="img/text.jpg">

<Style>
    .myslide {
        margin-left:-50px;
        margin-right:-50px;
    }
</style>

```