<div class="CardApplication" style="--columns: 7">
    <div class="item"></div>
    <div class="item"></div>
    <div class="item"></div>
    <div class="item"></div>
    <div class="item"></div>
    <div class="item"></div>
    <div class="item"></div>
    <div class="item"></div>
    <div class="item"></div>
    <div class="item"></div>
    <div class="item"></div>
    <div class="item"></div>
    <div class="item"></div>
    <div class="item"></div>
    <div class="item"></div>
    <div class="item"></div>
  </div>

.CardApplication {
  display: grid;
  grid-template-columns: repeat(3, 1fr) 2fr repeat(var(--columns, 5), 1fr);
}

.item {
  border: 1px solid red;
  height: 50px;
}