.field-name-field-header-image img { height: 100px; }
@media (min-width: 480px) { .field-name-field-header-image img  { height: 120px; } }
@media (min-width: 768px) { .field-name-field-header-image img  { height: 100px; } }
@media (min-width: 992px) { .field-name-field-header-image img  { height: 170px; } }
@media (min-width: 1200px) {.field-name-field-header-image img { height: 300px; } }