html {font-size: 100%;} /*16px*/

body {
    background: white;
    font-family: Montserrat, "Helvetica Neue", Helvetica, Roboto, Arial, sans-serif;
    font-weight: 400;
    line-height: 1.75;
    color: #000000;
}

p {margin-bottom: 1rem;}

h1, h2, h3, h4, h5 {
    /*margin: 3rem 0 1.38rem;*/
    font-family: Montserrat, "Helvetica Neue", Helvetica, Roboto, Arial, sans-serif;
    font-weight: 400;
    line-height: 1.3;
}

h1 {
    margin-top: 0;
    font-size: 3.052rem;
}
h2 {font-size: 2.441rem;}
h3 {font-size: 1.953rem;}
h4 {font-size: 1.563rem;}
h5 {font-size: 1.25rem;}
small, .text_small {font-size: 0.8rem;}

@media screen and (max-width: 1024px) {
    h1 {font-size: 2.488rem;}
    h2 {font-size: 2.074rem;}
    h3 {font-size: 1.728rem;}
    h4 {font-size: 1.44rem;}
    h5 {font-size: 1.2rem;}
    small, .text_small {font-size: 0.833rem;}
}

@media screen and (max-width: 640px) {
    h1 {font-size: 1.802rem;}
    h2 {font-size: 1.602rem;}
    h3 {font-size: 1.424rem;}
    h4 {font-size: 1.266rem;}
    h5 {font-size: 1.125rem;}
    small, .text_small {font-size: 0.889rem;}
}