Cant upload css to whole online store through custome css

I am use android mobile to build a shopify account to my online store gymom.in but I cannot enter my CSS cudtomes to all section

/* Apply styles to all div elements */

div {

/* CSS properties */

}

/* Apply styles to all ul elements */

ul {

/* CSS properties */

}

/* Apply styles to all p elements */

p {

/* CSS properties */

}

/* Header styling */

.header {

/* CSS properties */

}

/* Footer styling */

.footer {

/* CSS properties */

}

/* Footer links */

.footer a {

/* CSS properties */

}

/* Hover effect on footer links */

.footer a:hover {

/* CSS properties */

}

/* Featured product container */

.featured-product {

/* CSS properties */

}

/* Product title */

.featured-product .product-title {

/* CSS properties */

}

/* Product price */

.featured-product .product-price {

/* CSS properties */

}

/* Add to cart button */

.featured-product .add-to-cart {

/* CSS properties */

}

Please support me to entering css code to my shopify account

Warm regards

Hiralal Raut

gymom.in