body {
  background-color:#ccff90;
  background-color:#6090ff;
  background-image: url("bubbles.jpg");
  background-image: url("friedenstaube-rot.jpg");
  background-image: url("friedenstaube-blau.jpg");
  background-position: center;
  background-repeat: no-repeat;
}

.cos {
 display:flex;  margin:0;  padding:0;  justify-content:center;
 align-items:center;  min-height:90vh;
}

.cc {
 background-color:#e8e898;
 background-color:#ffffff;
 display:flex;  justify-content:center;  align-items:center;  maxheight:20rem;
 border:.3rem solid rgb(120,00,00);
 radding:2rem;  margin: 0rem;  max-width:21em;
}

.mw  {
 color:#002200;  padding:2rem;  font-size:1.8rem; 
 color:rgb(120,00,00);  padding:2rem;  font-size:1.8rem; 
}

.centered {
 position: fixed;
 top: 50%;
 left: 50%;
 /* bring your own prefixes */
 transform: translate(-50%, -50%);
}