Default Header template for widgets

Hello,

I cannot find a settings where I can change a default Header template for widgets (standard widgets for sidebars).

Regards

I guess there is only one quick way through re-defining of styles e.g. like this:

/* Re-define a default style for widget titles */
.widget .block-title {
text-align: center;
font-size: 17px;
font-weight: 500;
margin-top: 0;
margin-bottom: 26px;
line-height: 1;
padding: 14px 0;
position: relative;
background-repeat: no-repeat;
background-position: center center;
background-size: auto 100%;
border-bottom: none;
}
.widget .block-title:before {
content: '\e904';
font-family: 'newspaper', sans-serif;
font-size: 8px;
position: absolute;
bottom: -1px;
left: 0;
right: 0;
margin: auto;
line-height: 1;
}
.widget .block-title span {
display: inline-block;
background: none;
padding: 0;
}
.widget .block-title > * {
color: #000;
}