JSFiddle - React, Tailwind, and code Playground

by Tony Realovich

HTML

<ul>
    <li class="selected">
        <a href="#">Характеристики</a>
    </li>
    <li>
        <a href="#">Подробное описание</a>
    </li>
</ul>

CSS

ul {
    list-style: none;
    margin: 0;
    padding: 0;
    font-family: sans-serif;
}

ul li {
    display: block;
    float: left;
    margin: 0 14px;
}

a {
    display: block;
    text-decoration: none;
    padding: 4px 10px;
    background: #ccc;
    position: relative;
    color: #555;
    z-index: 9;
}

.selected a {
    background: #b8d34b;
    color: #fff;
    z-index: 10;
}

a:after,
a:before {
    content: " ";
    position: absolute;
    top: 0;
    bottom: 0;
    z-index: -1;
    width: 24px;
    background: #ccc;
}

a:after {
    border-top-right-radius: 2px;
    right: -12px;
    -webkit-transform:skewX(40deg);
    -moz-transform:skewX(40deg);
    -ms-transform:skewX(40deg);
    -o-transform:skewX(40deg);
    transform:skewX(40deg);
}

a:before {
    border-top-left-radius: 2px;
    left: -12px;
    -webkit-transform:skewX(-40deg);
    -moz-transform:skewX(-40deg);
    -ms-transform:skewX(-40deg);
    -o-transform:skewX(-40deg);
    transform:skewX(-40deg);
}

.selected a:after,
.selected a:before {
    background: #b8d34b;
}