/*#content {
  position: absolute; 
  left: 0; 
  right: 0; 
  margin-left: auto; 
  margin-right: auto; 
  width: 100px;
}*/



body {
  background: url(/images/watercolor.jpg);
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center -10%;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

.container {
  position: relative;
  height: 400px;
  border: 2px solid #006100;
}

.centered-element {
  margin: 0;
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
}