this is the code:
.nav-item-style {
margin: 3rem 3rem 3rem 3remt;
}
.nav-item-style:before,. Nav-item-style:after {
content:";
position: absolute;
margin-top: 0;
background: gray;
width: 5remt;
height: 1.5px;
}
.nav-item-style:before {
margin-left:-4.9remr;
}
.nav-item-style:after {
margin-left: 3.7remt;
}
this is the effect picture (that is, the part of the circle is removed):