How to create slanted tabs with a border in CSS? [duplicate]

Answer 1

You can try this approach: jsFiddle

Instead of using the borders to create the slanted effect, I'm using an :after pseudo element to create it. This allows me to set borders around it. Then I'm using a :before pseudo element to hide the borders which I don't want to see. The recurring 2px in the CSS is derived from the border width value.

CSS

.tab:before {
    height: 50px;
    width: 10px;
    display: block;
    content:" ";
    background-color: #FFF;
    position: absolute;
    right: -2px;
    top: -2px;
    border-top: 2px solid blue;
    border-bottom: 2px solid blue;
}
.tab {
    height: 50px;
    width: 150px;
    border-radius: 10px 10px 0px 0px;
    background-color: #FFF;
    position: relative;
    border: 2px solid blue;
}
.tab:after {
    display: block;
    content:" ";
    width: 100px;
    height: 50px;
    top: -2px;
    background-color: #FFF;
    position: absolute;
    right: -29px;
    transform:skewX(45deg);
    -ms-transform:skewX(45deg);
    -webkit-transform:skewX(45deg);
    border: 2px solid blue;
    z-index: -1;
}