background: #2C3E50;  /* fallback for old browsers */
background: -webkit-linear-gradient(to right, #4CA1AF, #2C3E50);  /* Chrome 10-25, Safari 5.1-6 */
background: linear-gradient(to right, #4CA1AF, #2C3E50); /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
.container {
  height: 200px;
  position: relative;
}
  
.center {
  margin: 0;
  position: absolute;
  top: 50%;
  left: 50%;
  -ms-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
}