Div with a transparent cut out circle [duplicate]

Answer 1

Here is my sollution

HTML:

CSS:

#shape {
    width:250px;
    height:250px;
    background:#448ccb;
    position:relative;
}

#shape:before {
    content:" ";
    position:absolute;
    width:250px;
    height:250px;
    background:#fff;
    left:0; top:-50%;
    border-radius:50%;
}

Link in jsfiddler: demo

Solition with box-shadow:

HTML:

CSS:

#wrap {
    background:#ccc;
    padding:20px;
}
#shape {
    width:250px;
    height:250px;    
    position:relative;
    overflow:hidden;
}

#shape:before {
    content:" ";
    position:absolute;
    width:100%;
    height:100%;
    left:0; top:-50%;
    border-radius:50%;
    box-shadow:0 0px 0 250px #448ccb
}

Link in jsfiddler: demo