@charset "UTF-8";

header:before{
    content: "";
    position: absolute;
    bottom: -39px;
    left: 0;
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 40px 130vw 0 0;
    border-color: var(--i_main_color) transparent transparent transparent;
    z-index: 1;
}
@media screen and (max-width: 600px){
header:before{
    bottom: -29px;
    border-width: 30px 100vw 0 0;
}
}