Custom Separator image instead of icon in enfold 4.6

hi guys,

i would like to have an image instead an icon.
unfortunately this topic doesnt work to me.
https://kriesi.at/support/topic/custom-separator-image-instead-of-icon/
is something changed in the meantime?
maybe somebody can help me.

until now, i have a separator and i had give them a unique name in the class section. for example “my-own-hr-line”.
when i input this code in the quick css,

span.av-seperator-icon {
    background-image: url(https://kriesi.at/wp-content/themes/kriesi/images/logo.png)!important;
    background-size: contain;
    background-repeat: no-repeat;
}
span.av-seperator-icon:before {
    color: transparent;
}

it changes all separator, everywhere.

thanks for help.