.swatch-option-tooltip.pti-has-image,
.swatch-option-tooltip-layered.pti-has-image {
    text-align: center;
}
.pti-tooltip-image {
    display: block;
    margin: 0 auto 4px;
    width: auto;
    height: auto;
    border-radius: 4px;
    background: #fff;
}