How to set the children height on absolute position parent - html

Question

I have problem with how to make children size following its parent. The case below.
HTML
<div class="video">
<div class="spot">
<img src="..." alt="">
<button>x</button>
</div>
</div>
CSS
.video {
width: 600px;
height: 500px;
background: #000;
position: relative;
}
.spot {
position: absolute;
max-height: 30px;
top: 0;
left: 0;
display: table;
margin: 0;
max-width: 100%;
/* width: 16%; only height can affect image on content*/
}
.spot img {
width: 100%;
height: 100%;
}
.spot button {
position: absolute;
top: 0;
left: 100%;
margin-left: -24px;
}
What I want to do is to make the image follow the spot height. Because if I set width (whatever size), the image will follow the spot width. Anyone know how to do this?
I also create jsfiddle https://jsfiddle.net/isatrio/yosfep6r/14/.

Answer 1

Your image is already following your .spot height. Check the border on spot. Or do you mean overflow? Or do you want your .spot to follow your .video?
console.log(".spot height: " + $(".spot").innerHeight());
console.log("img height: " + $(".spot img").height());
.video {
width: 600px;
height: 500px;
background: #000;
position: relative;
}
.spot {
border: red 2px solid;
position: absolute;
height: 40%;
/*width: 20%;*/
top: 0;
left: 0;
margin: 0;
padding: 0;
max-width: 100%;
overflow: hidden;
}
.spot img {
/*width: 150%;*/
height: 100%;
}
.spot button {
position: absolute;
top: 0;
left: 100%;
margin-left: -24px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="video">
<div class="spot">
<img src="https://creativeblossoming.files.wordpress.com/2013/10/navy-living-room.jpg" alt="">
<button>x</button>
</div>
</div>

Answer 2

You have set max-width instead of width. max-width will not set the width to the given value, it will just prevent the width from surpassing the given value.
.spot {
position: absolute;
height: 30px;
top: 0;
left: 0;
display: table;
margin: 0;
width: 100%;
}