test.css

body {
  margin: 0;
}

.fixed-size {
  width: 430px;
  height: 240px;
  position: absolute;
  top: 50%;
  left: 50%;
  margin-top: -120px;
  margin-left: -215px;
  background-image: url('https://unsplash.it/1200/600');
  background-position: center center;
  background-repeat: no-repeat;
  background-size: cover;
}

.fixed-size--alt {
  position: absolute;
  top: 0%;
  left: 0%;
  width: 100%;
  height: 240px;
  text-align: center;
}

.fixed-size--alt__align {
  position: absolute;
  top: 0;
  left: 50%;
  display: block;
  width: 480px;
  height: 100%;
  margin-left: -240px;
  overflow: hidden;
}

.fixed-size--alt__image {
  width: auto;
  height: 240px;
  display: block;
}

.ratio-size {
  position: relative;
  background-color: #333;
  width: 100%;
  height: 240px;
  overflow: hidden;
}

.ratio-size__content {
  background-color: red;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  background-position: center center;
  background-repeat: no-repeat;
  background-size: cover;
}

.center-box {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
}

.center-box:before {
  content: "";
  margin-right: -.25em;
  display: inline-block;
  height: 100%;
  vertical-align: middle;
}

.center-box__body {
  display: inline-block;
  vertical-align: middle;
  width: 100%;
}

.spotlight {
  text-align: center;
  font-weight: bold;
  font-size: 16px;
  line-height: 1;
  margin-top: 0;
  margin-bottom: 0;
  padding-left: 20px;
  padding-right: 20px;
  font-family: Arial, sans-serif;
  color: white;
  transition: font-size 200ms;
}

@media screen and (min-width: 320px) {
  .spotlight {
    font-size: 24px;
  }
  .fixed-size {
    width: 640px;
    height: 360px;
    margin-top: -180px;
    margin-left: -320px;
  }
}

@media screen and (min-width: 480px) {
  .spotlight {
    font-size: 32px;
  }
  .ratio-size {
    height: 0;
    padding-bottom: 50%;
  }
  .fixed-size--alt {
    height: 0;
    padding-bottom: 50%;
  }
  .fixed-size--alt__image {
    position: static;
    margin-top: 0;
    margin-left: 0;
    width: 100%;
    height: auto;
    min-height: 240px;
  }
  .fixed-size--alt__align {
    position: static;
    display: inline;
    margin-left: 0;
  }
  .fixed-size {
    width: 860px;
    height: 480px;
    margin-top: -240px;
    margin-left: -430px;
  }
}

@media screen and (min-width: 768px) {
  .spotlight {
    font-size: 48px;
  }
  .fixed-size {
    width: 1280px;
    height: 720px;
    margin-top: -360px;
    margin-left: -640px;
  }
}

@media screen and (min-width: 992px) {
  .spotlight {
    font-size: 64px;
  }
  .fixed-size {
    width: 1600px;
    height: 900px;
    margin-top: -450px;
    margin-left: -800px;
  }
}