Change color of text responding to background color

Answer 1

Another solution could be to make your image darker.

.infobox {
  width: 110mm;
  height: 65mm;
  background-image:url(https://i.pinimg.com/564x/86/70/f2/8670f2ab34bf4082bf3cef004aae0826.jpg);
  background-size: cover;
  position: relative;
}

.infobox:before {
  content: '';
  position: absolute;
  top: 0; right: 0; bottom: 0; left: 0;
  background: rgba(0, 0, 0, 0.4);
}

.text {
  position: absolute; bottom: 0; 
  text-align: center; color: white;
}

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