body {
  padding-top: 50px;
}

nav {
  position: fixed !important;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 10;
}

section {
  display: flex;
  width: 100%;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
}

section>div {
  background: #efefef;
  box-shadow: 2px 2px 5px #666;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  border-radius: 10px;
  margin: 5px;
  padding: 10px;
}

.hidden {
  opacity: 0;
  position: absolute;
  height: 0;
  width: 0;
}

.font,
h3 {
  color: #0f5384;
  font-weight: bold;
  text-align: center;
}

.font {
  cursor: cell;
  border: none;
  background-color: transparent;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

.font::selection {
  background: transparent;
}

.font:focus {
  outline: none;
  outline-width: 0;
}

img {
  width: 275px;
}

.nav-link {
  font-weight: bold;
  color: #aaa !important;
}

.nav-link[aria-expanded="true"] {
  color: #9c0 !important;
}

.card-body {
  flex: inherit;
}