html - Flexbox - align : center / justify : center with unknown height -


i trying split page 4 equal squares centered content. issue having centering content due .flex-item divs having viewport height, looking full flexbox solution, thank you.

i have tried following resources:

justify-content center

align-items center 

.flex-container {    display: -webkit-flex;    -webkit-flex-flow: row wrap;    flex-flow: row wrap;  }    .color_1 {    background: tomato;  }    .color_2 {    background: lightgreen;  }    .color_3 {    background: powderblue;  }    .color_4 {    background: steelblue;  }    .flex-item {    -webkit-flex: 1 0 auto;    flex: 1 0 auto;    width: 50%;    height: 50vh;  }
     <div class="flex-container">    <div class="flex-item color_1"><div class="inner"><p>inner</p></div></div>    <div class="flex-item color_2"><div class="inner"><p>inner</p></div></div>    <div class="flex-item color_3"><div class="inner"><p>inner</p></div></div>    <div class="flex-item color_4"><div class="inner"><p>inner</p></div></div>  </div>

make .flex-item flex containers, , use justify-content , align-items center content:

.flex-item {   display: flex;   justify-content: center;   align-items: center; } 

body {    margin: 0;  }  .flex-container {    display: flex;    flex-wrap: wrap;  }  .color_1 {    background: tomato;  }  .color_2 {    background: lightgreen;  }  .color_3 {    background: powderblue;  }  .color_4 {    background: steelblue;  }  .flex-item {    flex: 1 0 auto;    width: 50%;    height: 50vh;    display: flex;    justify-content: center;    align-items: center;  }
<div class="flex-container">    <div class="flex-item color_1"><div class="inner">inner</div></div>    <div class="flex-item color_2"><div class="inner">inner</div></div>    <div class="flex-item color_3"><div class="inner">inner</div></div>    <div class="flex-item color_4"><div class="inner">inner</div></div>  </div>


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