How to make angled tab like this using css?

Question

I need to make like this. Is it possible with pure css?

Answer 1

Here is the window typed tab buttons with css

.tablist{
    padding:0;
    margin:0;
    list-style:none;
    display:flex;
    justify-content:center;
}
.tablist>li{
}
.tablist >li>a{
    position: relative;
    display: block;
    color: red;
    text-decoration: none;
    line-height: 1.4;
    border-top: 1px solid red;
    border-radius: 6px 6px 0 0;
    padding: 3px 10px;
    margin: 0 5px;
}
.tablist >li>a:before{
    position: absolute;
    content: "";
    width: 9px;
    height: 29px;
    background: white;
    transform: rotate(21deg);
    border-left: 1px solid red;
    left: -5px;
    top: 2px;
    z-index: -1;
    border-radius: 2px 0 0 0px;

}
.tablist >li>a:after{
    position: absolute;
    content: "";
    width: 9px;
    height: 29px;
    background: white;
    transform: rotate(-21deg);
    border-right: 1px solid red;
    right: -5px;
    top: 2px;
    z-index: -1;
    border-radius: 2px 0 0 0px;

}

And the html will be like this

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