.rel {
  position: relative;
}
.abs {
  position: absolute;
}
.fixed {
  position: fixed;
}
.flex {
  display: flex;
  display: -webkit-box;
  /* Chrome 4+, Safari 3.1, iOS Safari 3.2+ */
  display: -moz-box;
  /* Firefox 17- */
  display: -webkit-flex;
  /* Chrome 21+, Safari 6.1+, iOS Safari 7+, Opera 15/16 */
  display: -moz-flex;
  /* Firefox 18+ */
  display: -ms-flexbox;
  /* IE 10 */
}
.flex-wrap {
  flex-flow: wrap;
}
.flex-between {
  -webkit-box-pack: justify;
  -ms-flex-pack: justify;
  -webkit-justify-content: space-between;
  justify-content: space-between;
}
.inline-block {
  display: inline-block;
}
.block {
  display: block;
}
.hide {
  display: none;
}
.bold {
  font-weight: 700;
}
.txt-center {
  text-align: center;
}
.txt-left {
  text-align: left;
}
.txt-right {
  text-align: right;
}
.before {
  opacity: 0;
  visibility: hidden;
}
.after {
  opacity: 1;
  visibility: visible;
}
.font {
  font-family: Arial;
}
.txt {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.upper {
  text-transform: uppercase;
}
.middle {
  vertical-align: middle;
}
.background {
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center center;
}
.mbackground {
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center center;
}
