JSFiddle - React, Tailwind, and code Playground

HTML

<div class="price_block">
<span class="price_bonus">
<a href="#" class="price">490 &#8381;</a>
</span>
<a href="#" class="bth">Купить пакет</a>
</div>

CSS

*{
  padding: 0;
  margin: 0;
}
body{
  font-family: Tahoma, Arial, sans-serif;
  color: #fff;
  background: #1C1B15;
  user-select: none;
}
a{
	text-decoration: none;
	color: #fff;
}
.price_block {
  display: flex;
}
.price_bonus{
  background: #434543;
  border-right: 2px solid #000;
  font-size: 23px;
  height: 46px;
  opacity: .9;
  overflow: hidden;
  padding-top: 4px;
  text-align: center;
  width: 50%;
  display: inline-block;
}
.bth{
background: #f26402;
border: none;
bottom: 0;
color: #fff;
cursor: pointer;
display: inline-block;
font-size: 23px;
height: 50px;
text-align: center;
width: 50%;
}
.bth:hover{
  background:  #ff7e00;
}