CSS Only Solution to Equal Height Columns in Avada by ThemeFusion (two plain columns with buttons)

avada-equal-height-plain-columns.css

/* For Avada by ThemeFusion */

/* The equal height problem is only an issue for larger devices. */
@media screen and (min-width: 1024px) {
    /* Make the column content equal height. */
    .your-classname-here .fusion-column-wrapper {
        height: 440px !important; /* Adjust for your content. */
    }
    /* These CSS selectors depend on what Avada buttons you use. Note the button-2 class--change as needed. */    
    .fusion-button.button-flat.button-small.button-default.button-2.fusion-button-default-span.fusion-button-default-type {
        position: absolute;
        bottom: 0;
        transform: translate(-50%, -50%);
    }
    /* These CSS selectors depend on what Avada buttons you use. Note the button-3 class--change as needed. */    
    .fusion-button.button-flat.button-small.button-default.button-3.fusion-button-default-span.fusion-button-default-type {
        position: absolute;
        bottom: 0; /* Ground the button to the bottom. Adjust as needed. */
        transform: translate(-50%, -50%); /* Center justify the button. */
    }
}