.header_nav li {
            list-style: none;
            position: relative;
            padding-bottom: 10px;
            
        }

        .header_nav li::before {
            position: absolute;
            content: '';
            width: 72px;
            height: 4px;
            flex-shrink: 0;
            background: #8B63FF;
            bottom: 0;
            left: 0;
            border: 1px solid blue;

        }

a: hover{
	color: FFFFFF;
}