.bd-placeholder-img {
  font-size: 1.125rem;
  text-anchor: middle;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

@media (min-width: 768px) {
  .bd-placeholder-img-lg {
      font-size: 3.5rem;
  }
}

main > .container {
    padding: 60px 15px 0;
  }
  
  .footer {
    background-color: #f5f5f5;
  }
  
  .footer > .container {
    padding-right: 15px;
    padding-left: 15px;
  }
  
  code {
    font-size: 80%;
  }
  
  input:invalid {
    border: 2px dashed red;
  }
  
  select:invalid {
    border: 2px dashed red;
  }
  
  input:invalid:required {
    background-color: pink;
  }
  
  select:invalid:required {
    background-color: pink;
  }