Pictures not show in a grid format in activity

Here is the solution for buddyboss Boss theme paste the following code in buddyboss>custom codes>css

.is-desktop.activity #buddypress ul.rtm-activity-media-list li {
display: inline-block;
width: 32.33%;
}
.activity ul.rtm-activity-media-list li > a {
display: block;
}
.activity #buddypress ul.rtm-activity-media-list li {
float: none;
}
.is-mobile.activity #buddypress ul.rtm-activity-media-list li {
display: inline-block;
width: 49%;
}