<h1 class="font-weight-400">h1 400 рус</h1>
<h1 class="font-weight-500">h1 500 рус</h1>
<h1 class="font-weight-600">h1 600 рус</h1>
<h5 class="font-weight-400">h5 400 рус</h5>
<h5 class="font-weight-500">h5 500 рус</h5>
<h5 class="font-weight-600">h5 600 рус</h5>
<p class="font-weight-400">p 400 рус</p>
<p class="font-weight-500">p 500 рус</p>
<p class="font-weight-600">p 600 рус</p>

h1, h5, p {
  font-family: 'Poppins';
}
.font-weight-400 {
  font-weight: 400;
}
.font-weight-500 {
  font-weight: 500;
}
.font-weight-600 {
  font-weight: 600;
}