:root {
  --base-width: 100%;
  --spacing: 20px;
}

.tablestrip-column {
  float: left;
 /*  width: calc(var(--c, 3)  * var(--base-width) / 1); */
/* width: calc(var(--c, 3)  / var(--base-width)); */
/*width: var(--cper, 33%);  */
/*width: 33%; */
  padding: 5px;
  border-radius: 2px;
  margin: auto;
}


.tablestrip-column:hover {
 background-color: rgba(0,0,0,0.3);
   border : 1px solid #ccc;

}

/* Clearfix (clear floats) */
.tablestrip-row::after {
  content: "";
  clear: both;
  display: table;
}