admin.html

<div class="row">
  <div class="col-md-8 p-3">
    <div class="login-box p-3 pl-5">
      <div class="row d-block text-center pb-3"><h2>ADMIN LOGIN</h2></div>
      <div class="row d-block">
        <form>
          <div class="form-group row">
            <label for="inputEmail3" class="col-sm-2 col-form-label">USERNAME</label>
            <div class="col-sm-6">
              <input type="email" class="form-control" id="inputEmail3" placeholder="Email">
            </div>
          </div>
          <div class="form-group row">
            <label for="inputPassword3" class="col-sm-2 col-form-label">PASSWORD</label>
            <div class="col-sm-6">
              <input type="password" class="form-control" id="inputPassword3" placeholder="Password">
            </div>
          </div>

          <div class="form-group row">
            <div class="col-sm-10 text-center">
              <button type="submit" class="btn btn-primary">Sign in</button>
            </div>
          </div>
        </form>
      </div>
    </div>
  </div>
</div>