JSFiddle - React, Tailwind, and code Playground

HTML

<span class="strikethrough">15000 руб.</span>

CSS

.strikethrough {
    position: relative;
    font-size: 40px;
}

.strikethrough:before {
    border-bottom: 3px solid red;
    position: absolute;
    content: "";
    width: 100%;
    height: 50%;
    transform: rotate(-7deg);
}