Hi webredactie,
You can add the following CSS code to the Backend > System > Site Template Styles > JA purity IV - Default > Tools > Custom CSS:
.nav-breakpoint-md .t4-megamenu .navbar-nav > li > a .item-caret {
width: 22px;
display: flex;
height: 22px;
align-items: center;
-webkit-box-align: center;
justify-content: center;
}
.t4-megamenu .dropdown-toggle .item-caret::before {
border-top: 4px solid #212529;
border-left: 4px solid transparent;
border-right: 4px solid transparent;
content: "";
display: block;
}
.t4-navbar .nav-item > a, .t4-navbar .nav-item > span {
display: -webkit-box;
display: -ms-flexbox;
display: flex;
-webkit-box-align: center;
-ms-flex-align: center;
align-items: center;
-webkit-box-pack: justify;
-ms-flex-pack: justify;
justify-content: space-between;
}
Hope this helps!