.panel-heading button{
    display: flex;
    align-items: center;
}
.panel-heading button .icon_show{
    transform: rotate(90deg);
    margin-right: 15px;
    transition: transform .5s;
}

.panel-heading button.collapsed .icon_show{
    transform: rotate(0deg);
}
.panel{
    padding-left: 22px;
    border-left: 2px solid #474559;
    margin-left: 22px;
}