.hex-main {
    display:flex;
    --s: 200px;  /* size  */
    --m: 4px;    /* margin */
    --f: calc(1.732 * var(--s) + 4 * var(--m)  - 1px);
}
  
.hex-container {
    font-size: 0; /*disable white space between inline block element */
}
  
.hex-container img {
    width: var(--s);
    margin: var(--m);
    height: calc(var(--s)*1.1547); 
    display: inline-block;
    font-size:initial;
    clip-path: polygon(0% 25%, 0% 75%, 50% 100%, 100% 75%, 100% 25%, 50% 0%);
    background: red;
    margin-bottom: calc(var(--m) - var(--s)*0.2885); 
}