.contenedor {
    margin-top: -15px;
    width: 100%;
    overflow: hidden;
    position: relative;
}
.presentacion {
    display: flex;
    width: 400%;
    margin-left: -100%;
}
.tolvas{
    width: 100%;
    display: flex;
    align-self: center;
    align-items: center;
    justify-content: center;
    background-color: #030e2e;
    position: relative;

}
.img_tolvas {
    width: 100%;
    height: 100%;
    display: block;
    align-self: center;
    object-fit: cover;
}
.texto_tolvas {
    width: 100%;
    position: absolute;
    background:linear-gradient(to top, rgb(11, 34, 61), #030e2e);
    text-align: center;
    font-size: 18px;
    bottom: 0px;
    padding: 18px;
    color: #fff;
    font-family: "spartan", sans-serif;
}
.boton {
    position: absolute;
    width: 70px;
    height: 80px;
    background: rgba(255, 255, 255, 0);
    top: 40%;
    font-size: 80px;
    font-weight: bold;
    font-family: monospace;
    text-align: center;
    cursor: pointer;
}
.boton:hover {
    color: #030e2e !important;
}
#derecho {
    right: 10px;
    color: #fff;
}
#izquierdo {
    left: 10px;
    color: #fff;
}