html - Why does this margin flows outsite its parent? -

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i have div mainlogo inside div logo. now, when give margin on top, flows outside outer divs. want when give margin-top, should displace downward, instead of flowing margin outside parent.

.header {    width: inherit;    height: 100px;    background-color: #0080ff;    box-shadow: 0.5px 0.5px 0.5px 0.5px grey;  }  .headerdiv img {    width: 80px;  }  .headerdiv {    width: 1020px;    margin: 0 auto;    height: inherit;    position: relative;  }  #mainlogo {    height: 80px;    width: 350px;    margin-top: 10px;  }
<div class="header">    <div class="headerdiv">      <a href="onlinequiz login.php">        <div id="mainlogo">          <img src="images/logo.png"></img>        </div>      </a>    </div>  </div>

why happen , how can solve it?

tricky margin spec. this page has explanation of behavior running into. if don't want change #mainlogo whitespace padding, can work around margin collapse giving overflow: hidden property .header.

.header {    width: inherit;    height: 100px;    background-color: #0080ff;    box-shadow: 0.5px 0.5px 0.5px 0.5px grey;    overflow: hidden;  }  .headerdiv img {    width: 80px;  }  .headerdiv {    width: 1020px;    margin: 0 auto;    height: inherit;    position: relative;  }  #mainlogo {    height: 80px;    width: 350px;    margin-top: 10px;  }
<div class="header">    <div class="headerdiv">      <a href="onlinequiz login.php">        <div id="mainlogo">          <img src="images/logo.png"></img>        </div>      </a>    </div>  </div>

also, might consider changing #mainlogo div span , self-closing img tag avoid unexpected cross-browser quirks.


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