body {
    font-family: Arial;
    text-decoration: none;
    font-size: 20px;
}

.button-demo {
    margin-top: 20px;
    margin-left: 20px;
}

.button-demo label {
    font-size: 18px;
    font-weight: normal;
    font-family: auto;
    color: black;
}

.demo-buttons-group {
    margin-top: 20px;
}

/* Rounded Button */
smart-button.button {
    display: inline-block;
    border-radius: 10rem;
    color: #fff;
    text-transform: uppercase;
    font-family: Arial;
    font-size: 20px;
    height: 53px;
    letter-spacing: .15rem;
    transition: all .3s;
    position: relative;
    overflow: hidden;
    z-index: 1;
    line-height: initial;
    background: transparent;
    width: auto;
    border: none;
    --smart-button-opacity-focus: initial;
    --smart-button-opacity-hover: initial;
    --smart-button-opacity-active: initial;
}

smart-button.button:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: #0cf;
    border-radius: 10rem;
    z-index: -2;
}

smart-button.button:before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0%;
    height: 100%;
    background-color: #008fb3;
    transition: all .3s;
    border-radius: 10rem;
    z-index: -1;
}

smart-button.button:hover {
    color: #fff;
}

smart-button.button:hover:before {
    width: 100%;
}