The HTML and CSS 'float' property

 

This question already has an answer here:

  • How do you keep parents of floated elements from collapsing? [duplicate] 16 answers

    • Edit : Ok I saw your website now, one solution is to add a <div class="clearfix"> after the h3 element. Then you style this div : 

    .clearfix{
  clear: both;
}

    First answer: If I understand your problem, you just want your white background covering your header. Since your header is position: relative , the code below should work : 

    header div{
 background-color: rgba(255,255,255,0.80)
 position: absolute;
 top: 0;
 bottom: 0;
 right: 0;
 left: 0;
}

    It simply set your white layer to position:absolute and stretch it to cover the container block, which is your header ;)

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