how to align bottom inside a div in css code example

Example 1: put header at bottom of div

#header {
  position: relative;
  min-height: 150px;
}

#header-content {
  position: absolute;
  bottom: 0;
  left: 0;
}

#header, #header * {
  background: rgba(40, 40, 100, 0.25);
}

Example 2: css div at bottom of div

/* Position inside div at the bottom of containing (outside) div */

<style>
.outside {
	position: relative;
    width: 200px;
    height: 200px;
    background-color: #EEE; /*to make it visible*/
}
.inside {
    position: absolute;
    bottom: 2px;
}
</style>
<div class="outside">
    <div class="inside">inside</div>
</div>