.sectionheader {
    width: 100%;
    height: 120px;
    background-color: var(--gray3);
    position: relative;
}
.sectionheader > .cut {
    height: 33.3%;
    aspect-ratio: 1;
    position: absolute;
    background-color: var(--gray1);
}
.sectionheader > .cut1 {
    top: 0; left: 0;
    clip-path: polygon(0% 0%, 100% 0%, 0% 100%);
}
.sectionheader > .cut2 {
    bottom: 0; right: 0;
    clip-path: polygon(0% 100%, 100% 0%, 100% 100%);
}
.sectionheader > h1 {
    width: 100%;
    text-align: center;
    line-height: 120px;
    font-size: 40px;
}

@media only screen and (max-width: 640px) {
    .sectionheader {
        height: 60px;
    }
    .sectionheader > h1 {
        line-height: 60px;
        font-size: 32px;
    }
}