#banner .slider ul{
    display: flex;
    padding: 0;
    width: 500%;
    animation: cambio 100s infinite alternate;
    animation-timing-function: linear;
}

.contenedor {
    width: 98%;
    margin: auto;
}

#banner{
    position: relative;
}

#banner article ul li img {
    width: 100%;
    height: 200%;

}

#banner .contenedor{
    position: absolute;
    width: 90%;
    text-align: center;
    top: 90%;
    left: 50%;
    transform: translateX(-50%) translateY(-50%);
    color: #fff;
    font-size: 28px;
    background: rgba(30,109,45,0.7);
    border-radius: 5px;
    padding: 10px;

}

#banner .contenedor nav{
    display: flex;
    margin-top: 20px;
}
#banner .contenedor nav input{
    margin: auto;
    font-size: 24px;
    border-radius: 5px;

}

@media (min-width:768px) { 
    #banner {
        height: 626px;
        overflow: hidden;
    }
    
    #banner article ul li img {
        height: 626px;
    }
   }

   @keyframes cambio{
    

    0%{margin-left:0}
    18%{margin-left:0}

    20%{margin-left:-100%}
    38%{margin-left:-100%}

    40%{margin-left:-200%}
    58%{margin-left:-200%}

    60%{margin-left:-300%}
    78%{margin-left:-300%}

    80%{margin-left:-400%}
    100%{margin-left:-400%}

}