.h1_div h1 {font-size:28px}
.main_text h2 {font-size:28px}
.main_text2 h3 {font-size:28px}
.paragraphe_keywords h4 {font-size:28px}
.paragraphe_keywords p a {color:inherit}

@media (max-width:1199.98px) {
  .h1_div h1 {font-size:30px}
  .main_text h2 {font-size:30px}
  .main_text2 h3 {font-size:28px}
  .paragraphe_keywords h4 {font-size:30px}
}

@media (max-width:991.98px) {
  .h1_div h1 {font-size:30px}
  .main_text h2 {font-size:30px}
  .main_text2 h3 {font-size:30px}
}

@media (max-width:767.98px) {
  .h1_div h1 {font-size:23px}
}

@media (max-width:575.98px) {
  .h1_div h1 {font-size:25px}
  .main_text h2 {font-size:30px}
  .main_text2 h3 {font-size:24px}
  .paragraphe_keywords h4 {font-size:25px}
}