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@mixin ctr($axis: "both"){
  position:absolute;
  @if $axis == "y"{
    top: 50%;
    transform: translateY(-50%);
  }
  @if $axis == "x"{
    left: 50%;
    transform: translateX(-50%);
  }
  @if $axis == "both"{
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
  }
}
.foo {
  position: absolute;
  height: 100%;
  width: 100%;
  background: red;
}
.bar {
  @include ctr(both);
  height: 100px;
  width: 50%;
  background: blue;
}
.content {
  @include ctr(both);
  color: #fff;
  font-family: helvetica, sans-serif;
  text-align: center;
  font-weight: bold;
  font-size: 18px;
  padding: 20px;  
  width: 100%;
  box-sizing: border-box;
}

<div class="foo">
  <div class="bar">
    <div class="content">Look ma, I'm centered!</div>
  </div>
</div>