* {
font-size: 15px;
}

p, a, li {
font-size: 15px !important;
line-height: 18px !important;
} 

h1 {
font-size: 28px !important;
}

h2 {
font-size: 23px !important;
}

h3 {
font-size: 20px !important;
}