#c-slider {
    margin: auto;
    align-content: center;
    justify-content: center;
    box-sizing: content-box;
    top: 50%;
    width: 50%;
    left:40%;
    right: 95%;
    border: 15px orange solid;
    max-width:%;
    position: absolute;
    overflow: hidden;
    box-shadow: 0 0 0 2px,
        0 1px 0px; 
}


#slider {
   display: flex;
    width: 400%;
    
    animation: cambio 20s infinite alternate linear;
}

#silder section {
    width: 100%;
}

#slider img {
    display: block;
    width: 100%;
    height: 100%;
}

#btn-prev, #btn-next {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.3);
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    line-height: 40px;
    font-size: 22px;
    font-weight: bold;
    text-align: center;
    border-radius: 50%;
    font-family: monospace;
    cursor: pointer;
}
#btn-prev:hover, #btn-next:hover {
    background: rgba(255, 255, 255, 1);
}

#btn-prev {
    left: 10px;
  
}
#btn-next {
    right: 10px;
}

@keyframes cambio {
    0% {margin-left: 0;}
    20% {margin-left: 0;}
    
    25% {margin-left: -100%;}
    45% {margin-left: -100%;}
    
    50% {margin-left: -200%;}
    70% {margin-left: -200%;}
    
    75% {margin-left: -300%;}
    100% {margin-left: -300%;}
}
/* RESPONSIVE 475PX */

@media (max-width:475px){
   #c-slider {
    margin: auto;
    align-content: center;
    justify-content: center;
    box-sizing: content-box;
    top: 22%;
    width: 90%;
    left:4%;
    right: %;
    border: 2px orange solid;
    min-width:%;
    position: absolute;
    overflow: hidden;
    box-shadow: 0 0 0 2px,
        0 1px 0px; 
       z-index: -1;
} 
    #slider {
   display: flex;
    width: 400%;
    
    animation: cambio 20s infinite alternate linear;
}

#silder section {
    width: 100%;
}

#slider img {
    display: block;
    width: 100%;
    height: 100%;
}

#btn-prev, #btn-next {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.3);
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    line-height: 40px;
    font-size: 22px;
    font-weight: bold;
    text-align: center;
    border-radius: 50%;
    font-family: monospace;
    cursor: pointer;
}
#btn-prev:hover, #btn-next:hover {
    background: rgba(255, 255, 255, 1);
}

#btn-prev {
    left: 10px;
  
}
#btn-next {
    right: 10px;
}

@keyframes cambio {
    0% {margin-left: 0;}
    20% {margin-left: 0;}
    
    25% {margin-left: -100%;}
    45% {margin-left: -100%;}
    
    50% {margin-left: -200%;}
    70% {margin-left: -200%;}
    
    75% {margin-left: -300%;}
    100% {margin-left: -300%;}
}

}