<div class="container">
  <div class="column c1">
    <div class="text">
      text in column 1
    </div>
  </div>
  <div class="column c2">
    <div class="text">
      text in column 2
    </div>
  </div>
  <div class="column c3">
    <div class="text">
      text in column 3
    </div>
  </div>
</div>

.container {
  display: flex;
}

.column {
  padding: 0 1em;
}

:not(.c1) .text {
  font-weight: bold;
}