Cross Browser Flex Columns

markup.html

<div class="columns flex-columns">
  <div class="col col-fixed">Hi</div>
  <div class="col col-flex">Mom</div>
</div>

style.css

.columns {
  display: table;
  width: 100%;
}

.columns > .col {
  float: left;
}

.flex-columns > .col {
  width: 50%;
}

.flex-columns > .col-fixed {
  width: 100px;
}

.flex-columns > .col-flex {
  display: table;
  width: 100%;
  margin-right: -100px;
  padding-right: 100px;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}

.flex-columns > .col-fixed + .col-flex {
  margin-left: -100px;
  padding-left: 100px;
  margin-right: 0;
  padding-right: 0;
}

.inline-columns {
  font-size: 0;
}

.inline-columns > .col {
  float: none;
  display: inline-block;
  vertical-align: middle;
  font-size: 1rem;
}