body {
  background-image: url("Background_small.png");
  background-repeat: repeat;
}

h1{
  font-family: "Lucida Console", Monaco, monospace;
  font-size: xx-large;
  background-color: #BCC595;
  color: #6E0D25;
}

h3{
  font-family: "Lucida Console", Monaco, monospace;
  font-size: large;
  background-color: #BCC595;
  color: #6E0D25;
}

<style>
.container {
  height: 200px;
  position: relative;
  border: 3px solid green;
}

.center {
  margin: 0;
  position: absolute;
  border: 3px;
  top: 50%;
  left: 50%;
  -ms-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
}
</style>