add br tag using css code example
Example 1: enter in css
white-space: pre-line
Example 2: new line ::after class
#headerAgentInfoDetailsPhone:after {
content:"Office: XXXXX \A Mobile: YYYYY ";
white-space: pre; /* or pre-wrap */
}
white-space: pre-line
#headerAgentInfoDetailsPhone:after {
content:"Office: XXXXX \A Mobile: YYYYY ";
white-space: pre; /* or pre-wrap */
}