JSFiddle - React, Tailwind, and code Playground

HTML

<div class="panel-left">
  <h2>Title Left</h2>
  <button class="btn-left" id="btn" type="button" onclick="console.log('button pressed');">Button Left</button>
</div>
<div class="panel-right">
  <h2>Title Right</h2>
  <button class="btn-right" id="btn" type="button" onclick="console.log('button pressed');">Button Right</button>
</div>

CSS

button {
    text-align: center;
    height: 75px;
    width: 225px;
    font-size: 30px;
    border-radius: 40px;
    overflow: hidden;
    border: none;
    position: relative;
    box-shadow: 0px 4px 15px rgba(0, 0, 0, 0.4);
    cursor: pointer;
}

.panel-left {
    background: rgba(0, 0, 0, 0.2);
    border-radius: 10px;
    display: grid;
    place-items: center;
    float: left;
    padding: 0px 30px 30px 20px;
    vertical-align: middle;
}

.panel-left h2 {
    font-family: Helvetica;
    text-align: center;
    padding-bottom: 5px;
    margin-left: auto;
}

.panel-right {
    background: rgba(0, 0, 0, 0.2);
    border-radius: 10px;
    display: grid;
    place-items: center;
    float: left;
    right: 500px;
    padding: 10px 20px 30px 20px;
    margin-left: 18%;
    margin-right: auto;
    vertical-align: middle;
}

.panel-right h2 {
    font-family: Helvetica;
    text-align: center;
    padding-bottom: 25px;
}

.btn-left {
    background: linear-gradient(90deg, #ff5e62, #ff9966);
}
.btn-left:hover {
    background: linear-gradient(90deg, #ff9966, #ff5e62);
}
.btn-left:active {
    background: linear-gradient(90deg, #d68359, #d36668);
}

.btn-right {
    background: linear-gradient(90deg, #ff9966, #ff5e62);
}
.btn-right:hover {
    background: linear-gradient(90deg, #ff5e62, #ff9966);
}
.btn-right:active {
    background: linear-gradient(90deg, #d36668, #d68359);
}