JSFiddle - React, Tailwind, and code Playground

HTML

<div class="layer">
  <table class=" fixtable table-body">
    <thead class="thead">
      <tr class="title-row">
        <th class="title-th">Артикул</th>
        <th class="title-th">Текущая МРЦ</th>
        <th class="title-th">Новая РРЦ</th>
      </tr>
    </thead>
    <tbody class="tbody">
      <tr class="table-row">
        <td class="td-body">2934/8C</td>
        <td class="td-body">20 369,00</td>
        <td class="td-body">14 258,30</td>
      </tr>
      <tr class="table-row">
        <td class="td-body">2756/6C</td>
        <td class="td-body">16 276,00</td>
        <td class="td-body">11 393,20</td>
      </tr>
      <tr class="table-row">
        <td class="td-body">2934/8C</td>
        <td class="td-body">20 369,00</td>
        <td class="td-body">14 258,30</td>
      </tr>
      <tr class="table-row">
        <td class="td-body">2934/8C</td>
        <td class="td-body">20 369,00</td>
        <td class="td-body">14 258,30</td>
      </tr>
      <tr class="table-row">
        <td class="td-body">2756/6C</td>
        <td class="td-body">16 276,00</td>
        <td class="td-body">11 393,20</td>
      </tr>
      <tr class="table-row">
        <td class="td-body">2934/8C</td>
        <td class="td-body">20 369,00</td>
        <td class="td-body">14 258,30</td>
      </tr>

      <tr class="table-row">
        <td class="td-body">2934/8C</td>
        <td class="td-body">20 369,00</td>
        <td class="td-body">14 258,30</td>
      </tr>
      <tr class="table-row">
        <td class="td-body">2756/6C</td>
        <td class="td-body">16 276,00</td>
        <td class="td-body">11 393,20</td>
      </tr>
      <tr class="table-row">
        <td class="td-body">2934/8C</td>
        <td class="td-body">20 369,00</td>
        <td class="td-body">14 258,30</td>
      </tr>
      <tr class="table-row">
        <td class="td-body">2934/8C</td>
        <td class="td-body">20 369,00</td>
        <td class="td-body">14 258,30</td>
      </tr>
      <tr...

SCSS

.fixtable-fixed {
	position: sticky;
	top: 0;
	z-index: 101;
  border: 1px solid #5a5959;
  background: #d3d6d5;
  padding: 5px 10px;
  width: 200px;
  overflow: hidden;
  
}

.layer {
    overflow: scroll; /* Добавляем полосы прокрутки */
    width: 600px; /* Ширина блока */
    height: 300px; /* Высота блока */
    padding: 5px; /* Поля вокруг текста */
    border: solid 1px black; /* Параметры рамки */
   } 

.scroll-table {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  width: 100%;
  font-size: 2.5rem;
  margin-top: 10px;
  margin-bottom: 15px;
  position: relative;
  box-sizing: border-box;
}

.thead
{
  width: 100%;
  max-width: inherit;
  position: sticky;
	top: 0;
}

.thead-fixed
{
  /* position: fixed;
  width: 100%;
  max-width: inherit; 
  top:0px; */
 

  
}

.preloader_table
{
  position: absolute;
  background-color: brown;
  width: 100%;
  height: 100%;
  z-index:1000;
}

.scroll-table-body {
  /* width:80%; */
  color: black;
  overflow: auto;
  height: 300px; 
  display: flex;
  justify-content: flex-end;
  align-items: end;
}

.title-row
{
  display: flex;
}

.title-th {
  display: flex;
  border: 1px solid #5a5959;
  background: #d3d6d5;
  padding: 5px 10px;
  width: 200px;

  top: 0;
  font-family: 'Roboto-Condensed';
  justify-content: center;
  align-items: center;

  
}

.title-th_big {
  border: 1px solid #5a5959;
  background: #d3d6d5;
  padding: 5px 10px;
  width: 6.6666%;
  
  
}

.title-table {
  background: #969595;
  color: black;
  font-size: 2rem;
}



.table-row > td {
  border-right: 1px solid #5a5959;
  padding: 5px 10px;
  border-bottom: 1px solid #5a5959;
  font-size: 1.5rem;
  font-family: 'Roboto-Condensed';
  
}

.table-row {
  display: flex;
  background: white;
}

.td-body
{
  width: 200px;
  border: 1px solid #5a5959;
  text-align: center;
  font-size: 2.3rem;
}

.table-row>.td-body
{
  text-align: left;
}

.table-row:nth-child(2n) {
  background: #d3d6d5;
}

.table-row:hover {
  background-color:...