.box {
transform: skewX(10deg);
}
.box > * {
transform: skewX(-10deg);
}
h3 {
background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg'
viewBox='0 0 200 10' preserveAspectRatio='none'%3E
%3Cpath d='M 1 0 H 198 L 199 9 L 2 10 z' fill='#ddd'/%3E%3C/svg%3E");
}