Position button inside a div to the bottom right - html

Question

I would like the button to be positioned at the bottom right of the red colored div. I used padding-bottom and margin-bottom properties but that does not seem to work. Could anyone please help?
.container {
display: flex;
flex-direction: column;
width: 300px;
height: 200px;
border: 1px solid blue;
padding: 8px;
}
.box {
width: 300px;
height: 150px;
border: 1px solid red;
}
.button {
float: right;
}
<div class="container">
<div class="box">
</div>
<div>
<button class="button">Click</button>
</div>
</div>

Answer 1

.button {
float: right;
position:relative;
transform:translate(-5px,-25px); //x and y controls
}

Answer 2

I have just answered the same thing to other question. ... Use position:relative. I see the point why people refrain from using it. But really ain't no shame. Especially when there isn't a parent-child relation between the elements.
.container {
display: flex;
flex-direction: column;
width: 300px;
height: 200px;
border: 1px solid blue;
padding: 8px;
}
.box {
width: 300px;
height: 150px;
border: 1px solid red;
}
.button {
float: right;
position:relative;
top: -22px;
}
<div class="container">
<div class="box">
</div>
<div>
<button class="button">Click</button>
</div>
</div>

Answer 3

An alternative to the other answers using display: grid instead. This is easier for the browser than using position absolute or float!!
/* ignore */ body { margin: 0 } * { box-sizing: border-box } /* ignore */
.container {
display: grid;
width: 50vw;
height: 100vh;
border: 1px solid blue;
padding: 8px;
}
.box, .button { grid-area: 1/1/-1/-1 }
.box { border: 1px solid red }
.button { margin: auto 0 0 auto }
<div class="container">
<div class="box">
</div>
<div class="button">
<button>Click</button>
</div>
</div>