html - CSS: Responsive 3x3 grid messing up on window resize -

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i'm trying make responsive 3x3 grid put noughts , crosses game on. it's working me when have maximized screen make window smaller check responsiveness messes up. what's going on? should use other vh's? http://codepen.io/apswak/pen/dxdjvw

<h3>noughts , crosses</h3> <div class="gamegrid">   <div class="cell"></div>   <div class="cell"></div>   <div class="cell"></div>   <div class="cell"></div>   <div class="cell"></div>   <div class="cell"></div>   <div class="cell"></div>   <div class="cell"></div>   <div class="cell"></div> </div>

style.css

body {   background-color: wheat;   margin: 0;   padding: 0; }  .gamegrid {   margin: 0 auto;   padding: 0;   width: 62vh;   height: 62vh; }  .cell {   margin-bottom: -5px;   display: inline-block;   width: 18.82vh;   height: 18.82vh;   border: 5px solid green;   background-color: blue; }

i'd take flexbox route. i've kept gamegrid class added row class , inside each row, i've added 3 cells. don't worry naming unless want to.

.gamegrid {    margin: 0 auto;    padding: 0;    width: 62vh;    height: 62vh;    background: green;  }  .gamegrid--row {    display: flex;    flex-flow: row;    justify-content: space-around;  }  .gamegrid--cell {    background: blue;    margin: 5px;    flex: 1 0 auto;  }  .gamegrid--cell:before {    content: '';    float: left;    padding-top: 100%;  }
<div class="gamegrid">    <div class="gamegrid--row">      <div class="gamegrid--cell"></div>      <div class="gamegrid--cell"></div>      <div class="gamegrid--cell"></div>    </div>    <div class="gamegrid--row">      <div class="gamegrid--cell"></div>      <div class="gamegrid--cell"></div>      <div class="gamegrid--cell"></div>    </div>    <div class="gamegrid--row">      <div class="gamegrid--cell"></div>      <div class="gamegrid--cell"></div>      <div class="gamegrid--cell"></div>    </div>  </div>


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