I am making a responsive website, and would like for my images to resize inside the divs when the browser window is stretched. I just accomplished this successfully on the last site I made, seemingly using the same technique. However, it is not working this time. To make my images resize, i use a large enough image so that it will work full screen, and then shrink down when the browser window shrinks. So, when I enter the HTML, I leave out the height and width so that it will adapt to the size of its container. Please let me know if you see something I don't that would make this not work! The code I have for this site is below.

HTML:

<div id="contentwrapper"> <div id="right"> <div id="imgdiv"><img src="images/sample.png"/> </div> </div> </div>

CSS:

contentwrapper {

width: 90%;
margin-right: auto;
margin-left: auto;

}

content {

padding-left: 260px;

}

right {

float: right;
width: 25%;

}

rightImgdiv {

width: 90%;

}