Template:Math theorem/sandbox/styles.css

/*  */
.math_theorem { 
	margin: 1em 0em;
}

/* Adjust the stypes when the screen width is 500 pixels or less */
@media (max-width: 500px) { 
    /* Target elements with the class "math_theorem" */
    .math_theorem { 
        /* Add vertical margins of 1em above and below the element */
        /* No horizontal margin (0em) on the left and right */
        margin: 0.75em 0em; 
    }
}