JSFiddle - React, Tailwind, and code Playground

HTML

<ul class="pagination clearfix">
  <li class="pagination-item"><a href="#" class="pagination-link">1. Адрес заказа</a></li>
  <li class="pagination-item"><a href="#" class="pagination-link">2. Оплата</a></li>
</ul>

CSS

*,
*:before,
*:after{
    box-sizing: border-box;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    -ms-box-sizing: border-box;
    -o-box-sizing: border-box;
}

.pagination-link,
.pagination-link:after{
    transition: all .3s;
    -webkit-transition: all .3s;
    -moz-transition: all .3s;
    -ms-transition: all .3s;
    -o-transition: all .3s;
}

* html .clearfix            {zoom: 1;}
*:first-child+html .clearfix{zoom: 1;}

.clearfix:before,
.clearfix:after{
    width: 100%;
    height: 0;
    content: '.';
    display: block;
    font-size: 0;
    visibility: hidden;
}

.pagination{
    margin: 0;
    padding: 0;
}

.pagination-item{
    margin: 0 0 0 44px;
    padding: 0;
    float: left;
    list-style-type: none;
}
.pagination-item:first-child{margin-left: 0;}

.pagination-link{
    background: #ccc;
    padding: 14px 12px;
    display: block;
    font-size: 15px;
    font-family: Times New Roman;
    color: #333;
    text-decoration: none;
    border: 1px solid #333;
    border-right: none;
    border-radius: 4px 0 0 4px;
    -webkit-border-radius: 4px 0 0 4px;
    -moz-border-radius: 4px 0 0 4px;
    -ms-border-radius: 4px 0 0 4px;
    -o-border-radius: 4px 0 0 4px;
    position: relative;
}

.pagination-link:hover,
.pagination-link:hover:after{background: #333;}

.pagination-link:hover{color: #fff;}

.pagination-link:after{
    background: #ccc;
    width: 33px;
    height: 33px;
    margin-left: -16px;
    content: '';
    display: block;
    border: 1px solid #333;
    border-bottom: none;
    border-left: none;
    transform: rotate(45deg);
    -webkit-transform: rotate(45deg);
    -moz-transform: rotate(45deg);
    -ms-transform: rotate(45deg);
    -o-transform: rotate(45deg);
    position: absolute;
    top: 6px;
    left: 100%;
    z-index: -1;
}