.footer {
  position: fixed;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 45px;
  background-color: #fff;
  text-align: center;
}

.accordion-button::after {
  display: none !important;
}

.is-invalid {
  border: 2px solid #8000ff !important;          
  box-shadow: 0 0 8px rgba(128, 0, 255, 0.6);    
  font-weight: bold;                             
  color: #4b0082 !important;                     
}