.container {
  position: fixed;      
  top: 0;
  left: 0;
  right: 0;
  background-color: #121212; 
  padding: 1em;
  box-shadow: 0 2px 5px rgba(0,0,0,0.5);
  z-index: 1000;        
  display: flex;
  flex-direction: column;
  align-items: center;
}