.nav-about{
    list-style-type: none;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
/*    border:2px solid green;*/
    width:40%;
    margin: auto;
}
.nav-about-list{
    margin: 5px;
    
}

.nav-about-link{
   padding:5px 20px;
    font-size: 1.5em;
    cursor: pointer;
/*    border:2px solid red;*/
}

.company_Certificate{
  
    width:70%;
    position:relative;
    margin:auto;
}
.about_active{
     background-color: #1e77df;
    color: aliceblue;
}
.about_active:hover{
   
    color: aliceblue;
}
.about_show{
    display:block;
}
.about_hide{
    display:none;
}
@media only screen and (max-width:800px){
    .nav-about{
/*       border:2px solid red;*/
        width:100%;
    }
    
}