<div class="input-field">
  <input type="text">
</div>

body {
  display: flex;
  min-height: 100vh;
  align-items: center;
  justify-content:center;
}

input {
    border: 1px solid #777;
    appearance: none;
}

.input-field:after {
  content: 'галочка';
  position: relative;
  
  left: -2.8rem;
  top: -.1rem;
  font-size: .7rem;
}