html - Vertically centering with flexbox -


i'm trying center div on webpage using flexbox. i'm setting following css properties. see it's being centered horizontally, not vertically. 

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

here's fiddle: jsfiddle

can explain i'm doing wrong?

a <div> element without explicit height defaults height of it's contents, block elements do. you'd want set 100% of it's parent, <body>, that's not enough, since block element. again, need set 100% height, match it's parent, <html>. , yet again, 100% still required.

but once done, annoying vertical scroll bar. that's result of default margin body has, , way box model defined. have several ways can combat that, easiest set margins 0.

see corrected fiddle.

html, body {    height: 100%;    margin: 0px;  }    .flex-container {  	display: flex;  	align-items: center;      justify-content: center;      height: 100%;  }    .item {      background-color: blue;      height: 50px;       width: 50px;  }
<div class="flex-container">      <div class="item">      </div>  </div>


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