Responsive Container zentriert
.container {
width: 400px;
height: 300px;
background-color: #ccc;
position: absolute;
/*it can be fixed too*/
left: 0;
right: 0;
top: 0;
bottom: 0;
margin: auto;
/*this to solve "the content will not be cut when the window is smaller than the content": */
max-width: 100%;
max-height: 100%;
overflow: auto;
}
Jolly Jellyfish