body {
  margin-top: 40px !important;
}

.fa-at {
  font-size: 1.5em !important;
  margin-top: 10px;
  margin-left: 5px;
}

.container {
  max-width: 650px !important;
}

.collapsible-header{
  transition: background-color 0.3s ease;
}
.collapsible-header:hover {
  background-color: #e9e9e9
}

#submit {
  display: flex;
  justify-content: center;
}