So i made little design for website and it is all good like this
but when i change size of window it turns to this
CSS:
.content-back{
margin-top: 10px;
padding: 20px;
width: auto;
height: auto;
box-shadow: 0 1px 1px 0 rgba(0, 0, 0, 0.2), 0 0px 5px 0 rgba(0, 0, 0, 0.19);
background-color: fff;
}
.split-left{
float:left;
width: 250px;
height: auto;
margin-right: 10px;
}
.split-middle{
float:left;
width: 630px;
height: auto;
margin-right: 10px;
}
.split-right{
float:left;
width: 300px;
height: auto;
}
HTML