Basic question regarding text alignment

Site URL: https://www.nickdavid.co.uk/lifestyle

Hi,

I am having an issue were I have some text that is on hover in the middle of my picture boxes on my website. The page is Summary: Wall.

Currently I am just using text-align: center, but while it is centered on left and right side, it is too far up from the middle. 

Any quick fix for centering the text properly?

.sqs-block-summary-v2 .summary-item:hover .summary-title a { 
    background-color: transparent !important; 
    opacity: 4 !important; 
    color: #000000 !important; 
    position: absolute !important;
    display: block !important;
    text-align: center !important;

Thank you,

Add to Home > Design > Custom CSS

div#block-yui_3_17_2_1_1595515032829_5160 .summary-title {
    position: absolute;
    top: 50%;
    transform: translate(-50%,-50%);
    left: 50%;
    z-index: 999;
    width: 100%;
}