.flecha {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(10, 118, 114, 0.7);
    color: white;
    border: none;
    padding: 10px;
    cursor: pointer;
    font-size: 24px;
    border-radius: 50%;
    z-index: 10;
    transition: background 0.3s;
}

.flecha.izquierda {
    left: 10px;
}

.flecha.derecha {
    right: 10px;
}

.flecha:hover {
    background: rgba(10, 118, 114, 1);
}