* {
  box-sizing: border-box;
}
*:before, *:after {
  box-sizing: inherit;
}

.calendar-container {
  width: 600px;
}
.calendar {
  border-bottom: 1px solid rgba(0, 0, 0, .5);
  border-right: 1px solid rgba(0, 0, 0, .5);
  width: 100%;
}
.day {
  border-top: 1px solid rgba(0, 0, 0, .5);
  border-left: 1px solid rgba(0, 0, 0, .5);

  padding: 15px;

  text-align: center;
}
.day.adj-month {
  background-color: rgba(0, 0, 0, .1);
  opacity: .5;
}

.calendar-item {
  display: block;
  height: 5px;

}

.calendar-control {
  background-color: rgb(225, 225, 225);
  border: 1px solid rgba(170, 170, 170, .7);
  cursor: pointer;
  display: inline-block;
  padding: 4px 12px;
}

.calendar-control[data-calendar-control="prev"] {
  float: left;
}
.calendar-control[data-calendar-control="next"] {
  float: right;
}