html,
  body {
      height: 100%;
  }

  .principal {
    display: flex;
    align-items: center;
    padding-top: 40px;
    padding-bottom: 40px;
    background-color: white;
    /* height: 100%; */
}


@media (max-width:576px){
    .principal{
        background-color: lightyellow;
        height: 100%;
    }
}
        


/* .form-signin, */
.identificate{
    width: 100%;
    max-width: 330px;
    padding: 15px;
    margin: auto;
}

.identificate .checkbox {
    font-weight: 400;
}

.identificate .form-floating:focus-within {
    z-index: 2;
}

.identificate input[type="email"] {
    margin-bottom: -1px;
    border-bottom-right-radius: 0;
    border-bottom-left-radius: 0;
}

.identificate input[type="password"] {
    margin-bottom: 10px;
    border-top-left-radius: 0;
    border-top-right-radius: 0;
}