.formula-wrapper {
  position: relative;
}

.formula-wrapper .formula-text {
  opacity: 0;
  color: transparent;
  position: absolute;
  font-size: 0;
  top: 0;
  right: 0;
  width: 100%;
  height: 100%;
  text-indent: -10000px;
  z-index: 20;
}

.formula-container {
  padding: 40px;
  cursor: text;
  position: relative;
  line-height: 2.8;
}

.formula-container .formula-drag {
  display: inline;
  padding: 12px 4px;
  border-radius: 3px;
  vertical-align: middle;
  background-color: rgba(26, 94, 255, .15);
}

.formula-container .formula-cursor {
  display: inline-block;
  vertical-align: middle;
  height: 20px;
  width: 1px;
  background-color: #ababab;
  background-color: rgba(0, 0, 0, .6);
}

.formula-container .formula-unit,
.formula-container .formula-operator,
.formula-container .formula-item {
  display: inline;
  vertical-align: middle;
  padding: 0 10px;
  word-break: break-all;
  margin: 6px;
  vertical-align: middle;
  border-radius: 999px;
  background-color: #ffffff;
  -webkit-box-shadow: 0 3px 8px rgba(0, 0, 0, .375);
  -moz-box-shadow: 0 3px 8px rgba(0, 0, 0, .375);
  box-shadow: 0 3px 8px rgba(0, 0, 0, .375);
}

.formula-container .formula-item {
  display: inline-block;
  border-radius: 999px;
  color: #333333;
  height: 24px;
  line-height: 24px;
  position: relative;
  overflow: hidden;
}

.formula-container .formula-item .formula-type {
  display: inline-block;
  vertical-align: middle;
  padding: 0 10px;
  min-width: 80px;
  height: 24px;
  line-height: 24px;
  font-size: 13px;
  font-weight: 600;
  word-break: break-all;
  text-align: center;
  -o-box-sizing: border-box;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
  background-color: #5e636c;
  margin-right: .8em;
  color: #ffffff;
}

.formula-container .formula-operator {
  display: inline-block;
  margin-top: 0;
  margin-bottom: 0;
  width: 24px;
  height: 24px;
  line-height: 24px;
  padding: 0;
  text-align: center;
  font-weight: 600;
  color: #f6474e;
  border-color: #f6474e;
}

.formula-container .formula-bracket {
  background-color: transparent;
  border: 0;
  color: #12c2b7;
}

.formula-alert {
  position: absolute;
  width: 140px;
  height: 42px;
  line-height: 38px;
  color: #777777;
  box-sizing: border-box;
  -o-box-sizing: border-box;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  border: 1px solid #d8d8d8;
  border-right: 0;
  border-top: 0;
  background-color: #fafafa;
  border-top: 3px solid #ababab;
  text-align: center;
  top: 0;
  right: 1px;
  z-index: 10;
}

.formula-alert.formula-alert-good {
  color: #88ccab;
  border-top-color: #88ccab;
}

.formula-alert.formula-alert-error {
  color: #ff9090;
  border-top-color: #ff9090;
}

.formula-prefix {
  color: rgba(0, 0, 0, .7);
}

.formula-surfix {
  color: rgba(0, 0, 0, .3);
}