/* <length> values */
column-gap: 20px;
column-gap: 1em;
grid-column-gap: 20px;
grid-column-gap: 1em;
/* <percentage> value */
column-gap: 10%;
grid-column-gap: 10%;
/* calc() values */
column-gap: calc(10% + 20px);
grid-column-gap: calc(10% + 20px);