'Position: bottom' not working on relatively positioned button element

Question

Goal : Get the button element fixed to the bottom of the main element. I tried positioning it's container with relative positioning so it sticks to the bottom:

/* POSITIONING NOT WORKING. I WANT THIS DIV FIXED TO BOTTOM OF PARENT */
.wrapper:nth-child( 4 ) {
  background-color: #bbb;
  position: relative;
  bottom: 0;
}

This isn't moving the .wrapper div at all. Ideas?

 @import url( "https://necolas.github.io/normalize.css/latest/normalize.css" ); * { box-sizing: border-box; } main { background-color: #eee; } main, input { padding: 2%; } main input { width: 100%; margin: 5% 0; border: 0; } .clr-fix::after { content: ""; display: block; clear: both; } .wrapper { width: 23%; margin: 1%; padding: 2%; background-color: #ddd; float: left; } /* POSITIONING NOT WORKING. I WANT THIS DIV FIXED TO BOTTOM OF PARENT */ .wrapper:nth-child( 4 ) { background-color: #bbb; position: relative; bottom: 0; } 

 <main class="clr-fix"> <div class="wrapper"> <input type="text" value="position:bottom"> <input type="text"> <input type="text"> <input type="text"> </div> <div class="wrapper"> <input type="text"> <input type="text" value="Isn't working"> <input type="text"> <input type="text"> </div> <div class="wrapper"> <input type="text"> <input type="text"> <input type="text" value="On 'A button'"> <input type="text"> </div> <div class="wrapper"> <button>A button</button> </div> </main> 

Answer 1

Relative positioning is a change in relation to the spot the element is already positioned. So if position: relative, bottom: 0 (or top:0, left:0, right:0, etc) means leave this at the same spot it currently is.

If you want this positioned to the bottom of the element, you need to make the parent element position: relative, and the element you want pinned to the bottom position: absolute (with bottom: 0). Absolutely positioned elements will hop on out of the DOM flow and go instead in relation to it's closest relative parent.

essentially you want:

.wrapper {
  position: relative;
}

.wrapper:nth-child(4){
  position: absolute;
  bottom: 0;
}

Answer 2

Your main style will need a relative position applied to it. As mentioned, you can't position bottom:0 with relative positioning. See if this works for you.

main{
  background-color: #eee;
  position: relative;
}
.wrapper:nth-child(4) {
  background-color: #bbb;
  position: absolute;
  bottom: 8%;
  right: 1%;
}

Answer 3

To make the 4'th wrapper stick to bottom you need to put position: relative; on main and add position: absolute to the 4'th wrapper.

a position: absolute; element is absolutely positioned relatively to it's closest parent which is position: relative; - in your case that would be main which wraps the 4'th wrapper.