.wp-block-heading.is-style-circle-background {
    position: relative;
    font-size: 3rem;
    width: 200px;
    height: 150px;
    display: flex;
    align-items: center;
    z-index: 1;
}

.wp-block-heading.is-style-circle-background::before {
    content: "";
    display: block;
    width: 150px;
    height: 150px;
    border-radius: 9999px;
    border: 3px solid var(--wp--preset--color--turquoise-dark);
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    z-index: -1;
}

.wp-block-columns .wp-block-column:last-child .wp-block-heading.is-style-circle-background {
    justify-content: flex-end;
    margin-left: auto;
}
@media only screen and (min-width: 990px) {
    .wp-block-heading.is-style-circle-background {
        font-size: 5rem;
        width: 300px;
        height: 250px;
    }
    .wp-block-heading.is-style-circle-background::before {
        width: 250px;
        height: 250px;
    }
}