.main-panel {
  height: 100%;
}

.main-panel .row {
  height: 100%;
}

.login-panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 300px;
  height: 400px;
  box-shadow: 0 0 20px #b3b3b3;
  padding: 20px 10px;
}

.login-panel .login-user-avatar {
  min-width: 150px;
  min-height: 150px;
  background-image: url(../../assets/img/user-icon.jpg);
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  border-radius: 50%;
  margin: 20px 0;
  -webkit-filter: grayscale(100%);
  filter: gray;
  transform: rotateY(0deg);
  backface-visibility: hidden;
  transition: transform .4s ease;
}

.login-panel .login-form input {
  border: 0;
  border-bottom: 1px solid gray;
  border-radius: 0;
}

.login-panel .login-form input:focus, .login-panel .login-form input:active, .login-panel .login-form input:hover {
  outline: none;
  box-shadow: none;
}

.login-panel .login-form .btn.btn-primary {
  margin-top: 40px;
  text-transform: uppercase;
  border-radius: 0;
}

.login-panel .login-response {
  max-height: 0;
  width: 100%;
  transition: max-height .4s ease;
}

.login-panel .login-response.has-error {
  max-height: 100px;
}