como desativar a margem desabando

/* This would create a small buffer between parent's and children elements's 
   margins. As such, margins won't collapse anymore.*/
.parentClass {
    padding: 0.05px;
}

/* Another solution would be to turn off margin-top on typography elements */
h1, h2, h3, p {
	margin-top: 0;  
}
Wissam