html,
body {
  height: 100%;
}
 
body {
  display: flex;
  align-items: center;
  padding-top: 40px;
  padding-bottom: 40px;
  background-color: #f5f5f5;
}
 
.form-signin {
  width: 100%;
  max-width: 550px;
  padding: 15px;
  margin: auto;
}
 
.form-signin .checkbox {
  font-weight: 400;
}
 
.form-signin .form-floating:focus-within {
  z-index: 2;
}

.bd-placeholder-img { font-size: 1.125rem; 
text-anchor: middle;        
-webkit-user-select: none;        
 -moz-user-select: none;        
 user-select: none;       }    
 @media (min-width: 768px) { .bd-placeholder-img-lg {  font-size: 3.5rem;  }   }