.navigation_ecran
    {
    padding: 15px 0 1.68rem 15px;
    margin: 0;
    }

ul.navigation_ecran
    {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    }

.navigation_ecran li
    {
    color: white;
    text-align: center;
        
    
    background-color: #212121;
    padding: 5px 10px 5px 10px;
    margin: 5px;
    
    /*border-width: 1px;
    border-color: yellow;
    border-style: solid;*/
        
    border-radius: 2px;
    }

.navigation_ecran a:hover li
    {
    color: #212121;
        
    background-color: rgba(33, 33, 33, 0)!important;
    padding: 5px 10px 5px 10px;
    margin: 5px;
    
    box-shadow: none;
        
    transition: .1s;
    }

.navigation_ecran a img
    {
    filter: grayscale(100%);
        
    transition: .1s;
    }

.navigation_ecran a:hover img
    {
    filter: grayscale(0%);
        
    transition: .1s;
    }

/*.navigation_ecran a:hover ~ a img
    {
    filter: grayscale(100%);
        
    transition: .1s;
    }
*/

a:hover < li
    {
    color: #212121;
        
    background-color: rgba(33, 33, 33, 0);
    padding: 5px 10px 5px 10px;
    margin: 5px;
    
    box-shadow: none;
        
    transition: .1s;
        
    }