.align-items-center{
  -webkit-box-align: center !important;
  align-items: center !important;
  -ms-flex-align: center !important;
}

.row {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -ms-flex-wrap: wrap;
  flex-wrap: wrap;
  margin-right: -15px;
  margin-left: -15px;
}

.col-half, .col-full {
  position: relative;
  width: 100%;
  min-height: 1px;
  padding-right: 15px;
  padding-left: 15px;
}

.col-full {
  -webkit-box-flex: 0;
  -ms-flex: 0 0 100%;
  flex: 0 0 100%;
  max-width: 100%;
}

@media (min-width: 768px){
.col-half {
  -webkit-box-flex: 0;
  -ms-flex: 0 0 50%;
  flex: 0 0 50%;
  max-width: 50%;
  box-sizing: border-box;
}
}

.btn {
  display: inline-block;
  font-weight: 400;
  text-align: center;
  white-space: nowrap;
  vertical-align: middle;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  border: 1px solid transparent;
  padding: 0.375rem 0.75rem;
  font-size: 1rem;
  line-height: 1.5;
  border-radius: 0.25rem;
  transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out, border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
  color: #fff;
  background-color: #007bff;
  border-color: #007bff;
}

.btn:hover {
  color: #fff;
  background-color: #0069d9;
  border-color: #0062cc;
}

.btn:focus, .btn.focus {
  box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.5);
}