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<!DOCTYPE html>
<html>
<head>
<style>
.flex-container {
   display: -webkit-flex;
   display: flex;
   -webkit-align-items: baseline;
   align-items: baseline;
   width: 400px;
   height: 250px;
   background-color: lightgrey;
}

.flex-item {
   background-color: cornflowerblue;
   width: 100px;
   margin: 10px;
}
</style>
</head>
<body>

<div class="flex-container">
  <div class="flex-item">flex item 1</div>
  <div class="flex-item">flex item 2</div>
  <div class="flex-item">flex item 3</div>
</div>

</body>
</html>

<!DOCTYPE html>
<html>
<head>
<style> 
.flex-container {
    display: -webkit-flex;
    display: flex;
    -webkit-align-items: baseline;
    align-items: baseline;
    width: 400px;
    height: 250px;
    background-color: lightgrey;
}

.flex-item {
    background-color: cornflowerblue;
    width: 100px;
    margin: 10px;
}
</style>
</head>
<body>

<div class="flex-container">
  <div class="flex-item">flex item 1</div>
  <div class="flex-item">flex item 2</div>
  <div class="flex-item">flex item 3</div>  
</div>

</body>
</html>