The width of the HTML sub-div is always equal to the width of the parent div

Recently I am doing a personal webpage, in a DIV inserted Baidu Map API, then the problem comes, because Baidu map generated is fixed size, if the Web page with mobile phone side open, will find some map can not see, in order to solve this problem, I handle div width is always equal to the width of the parent Div, This is normal.

Code:

<div id= "Bigone" >

<div style= "Height:490px;border: #ccc solid 1px; -webkit-box-sizing:border-box;-moz-box-sizing:border-box;box-sizing:border-box;" Id= "Ditucontent" ></div>

</div>

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The width of the HTML sub-div is always equal to the width of the parent div