It didn’t work as expected. I found a perfect solution. It’s simple and works perfectly

.h1-ueberschrift
{
font-family: UniversLT-CondensedBold, Arial,sans-serif;
font-size: 3em;
font-weight: normal;
line-height: 1.7 !important;
color: #ffffff !important;
background-color: #000000 !important;
display: inline;
text-transform: uppercase;
padding-top: 1.8%;
padding-right: 0;
padding-bottom: 1.0%;
padding-left: 0%;
box-shadow: 0.25em 0 0 #000000, -0.25em 0 0 #000000;
}

Thanks for your help.