Height 100% not working for nested div

Question

I was tried to make child div take height 100% but it\'s not working, so I\'d like to know why it is not working: I give html, body height: 100% then .hero height 100% and .

Answer 1

Height 100% is a very elusive issue, and normally creates more problems than it solves. However, to answer your question:

Basically, every container between the html element and the element you want to be 100% must have height: 100%; on it.

So, in your case, this means the following CSS must be added:

/* These styles get all of the containers to 100% height */
/* address ONLY sub-elements of .hero element to prevent issues with other pages / code */
.hero .container-fluid,
.hero .row,
.hero [class*="col-"] {
   height: 100%;
}

Below is your code, built into a snippet, so you can see it work. Note that I've additionally added col-sm-6 classes to your col-lg-6 elements so you can see it work in a narrower window. (NOTE: click the "Expand Snippet" link in order to get a wide enough window to see it working).

html,
body {
  height: 100%;
}

.hero {
  width: 100%;
  height: 100%;
  border: 1px solid #0094ff;
}

.hero-image {
  width: 100%;
  height: 100%;
  background-image: url('http://via.placeholder.com/500x100');
  background-size: cover;
}

/* These styles get all of the containers to 100% height */
.hero .container-fluid,
.hero .row,
.hero [class*="col-"] {
   height: 100%;
}

  

    

      

        

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Hey, I Am Mike Ross
          

            Creative Art Director from San Francisco. Husband, photographer, surfer and tech fanatic.