Youzify (formerly Youzer)

1. Go to "wp-content/plugins".

2. Open the file "bp-custom.php" ( if you didn't find it just create a new one ).

3. Paste the code below :

<?php
/** * Remove Theme Default Buddypress CSS */
function youzify_remove_default_bp_css() {
    // 27 Theme
    wp_dequeue_style( 'c27-buddypress-style' );
}
add_action( 'wp_enqueue_scripts' , 'youzify_remove_default_bp_css', 999 );

4.For the css goto youzer Panel > General Settings > Custom Styling Code > Global Styling Settings 

and paste this code in "Global Custom Css" 

.bp-user .yz-page {
    margin-top: 89px;
}
.buddypress.bp-user  .c27-main-header.header.header-fixed {
    background-color: rgba(29, 35, 41, 0.98);
}
.buddypress.listings .yz-sidebar-column {
    display:none;
}
#buddypress.youzer #activity-stream .ac-reply-content a {
    background: transparent;
    color: #898989;
    font-weight: 600;
}
.directory.activity #buddypress div.item-list-tabs ul li.selected a,
#buddypress.youzer #activity-stream .ac-reply-content a:hover  {
    background:transparent !important;
}
.youzer #activity-stream .ac-reply-content input[type="submit"] {
    width:initial;
}
@media screen and ( max-width: 1024px ) {
    .bp-user .yz-page {
    margin-top: 80px;
    }
}
@media screen and ( max-width: 425px ) {
    .bp-user .yz-page {
    margin-top: 60px;
    }
}