.head-nav{
    display: flex;
    justify-content:space-between;
}
.head-nav h1{
    margin-left: 30px;
    height: 60px;
    line-height: 60px;
    font-size: 25px;
    font-weight: 600;
    color: #2f363c;
}    
.head-nav ul{
    display: flex;
    justify-content:space-between;
    align-items: center;
    height: 60px;
}
.head-nav li{
    margin: 0 10px;
}
.head-nav a span{
    padding: 10px 20px; 
    border-radius: 20px;
}
.head-nav a .username{
    font-size: 18px;
}
.head-nav .register{
    border: 1px solid #d2d2d2; 
}
.head-nav .register:hover{
    border: 1px solid #1e9fff;
}
.head-nav a:hover span{
    background-color: #eeeeee;
}
.head-nav a:hover .username{
    font-weight: 500;
    color: #1e9fff;
}