.preference_mask {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  z-index: 10;
  background-color: rgba(1, 1, 1, 0.3);
}

.preference_window {
  position: absolute;
  background-color: white;
  display: inline-block;
  padding: 10px 20px;
  width: 60%;
  margin: 20%;
  box-shadow: 0px 1px 3px 0px rgba(0,0,0,0.8);
}

.preference_title {
  color: #546e7a;
  text-align: left;
  border-bottom: 1px solid rgba(0,0,0,.12);
  font-family: 'Roboto', Helvetica, Arial, sans-serif;
  width: 100%;
  height: 40px;
}

.preference_content {
  width: 100%;
  font-size: 1.4rem;
}

.preference_desc {
  margin-left: 5px;
  cursor: pointer;
  font-weight: normal;
}

.preference_footer > .kf_elem {
  flex: 1 1 100%;
}
