Hello,
Please add following code in custom.css file.
.left-bar .left-titles .tab-title-left{
border-style: none;
}
.toggle-block .toggle-element > a{
border-bottom: none;
padding: 21px 0;
}
.left-bar .left-titles .tab-title-left.opened:after,
.left-bar .left-titles .tab-title-left.opened:before{
display:none;
}
.tabs .tab-content{
margin-top: 10px !important;
}
.left-bar .tab-content{
border: none;
}
Regards,
Robert Hall.