html - Margin-top not working when an image is centered horizontally - Phonegap -

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i new webdesign, using phonegap (html5) centered image horizontally way:

.html

  <div id="loginholder" >      <img id="image_person" src="img/icon_login.png" />    ...

.css

    #image_person {         display:block;             margin-left:auto;         margin-right:auto;         margin-top: 30px;     }      ...      #loginholder{         background-color: #29aae1;         height: 200px;         width: 70%;           margin: 0 auto;    }    ...
  • please why margin-top not working?

you need trigger layout. add overflow:hidden #loginholder


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