JSFiddle - React, Tailwind, and code Playground

HTML

<div class="button">
    <svg width="100%" height="100%">
        <ellipse cx="50%" cy="-40%" rx="100%" ry="100%" style="fill:#7ca6d8;" />
    </svg>
    <div>Мега<br> кнопка<br></div>
</div>

CSS

body{background:#000}
.button {
    background: #f58020;
    /*-webkit-border-radius: 5px;
    -moz-border-radius: 5px;
    border-radius: 5px;*/
    display: inline-block;
    overflow: hidden;
    padding: 1em 1.5em 1em 1em;
    position: relative;
}
.button:after,
.button:before {
    background: #fff;
    content: '';
    height: 50%;
    position: absolute;
    right: 0;
    width: 15px;
    z-index: 1;
}
.button:after {
    bottom: -7px;
    -webkit-transform: skewY(-45deg);
    -moz-transform: skewY(-45deg);
    -ms-transform: skewY(-45deg);
    -o-transform: skewY(-45deg);
    transform: skewY(-45deg);
}
.button:before {
    top: -7px;
    -webkit-transform: skewY(45deg);
    -moz-transform: skewY(45deg);
    -ms-transform: skewY(45deg);
    -o-transform: skewY(45deg);
    transform: skewY(45deg);
}
.button svg {
    height: 100%;
    left: 0;
    position: absolute;
    top: 0;
    width: 100%;
}
.button div {
    color: #fff;
    font-size: 40px;
    font-weight: bold;
    position: relative;
    z-index: 1;
}