style.css

* {
    padding: 5px;
}

h2 {
    width: 300px;
}

button {
    width: 300px;
    font-size: 12px;
    background-color: #008542;
    color: #fff;
    text-shadow: 0 2px 0 rgb(0 0 0 / 25%);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    position: relative;
    border: 0;
    z-index: 1;
    user-select: none;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 1px;
    white-space: unset;
    padding: 0.8rem 1.5rem;
    text-decoration: none;
    font-weight: 900;
    transition: all 0.7s cubic-bezier(0, 0.8, 0.26, 0.99);
    margin-bottom: 15px !important;
}

button:before {
    position: absolute;
    pointer-events: none;
    top: 0;
    left: 0;
    display: block;
    width: 100%;
    height: 100%;
    content: "";
    transition: 0.7s cubic-bezier(0, 0.8, 0.26, 0.99);
    z-index: -1;
    background-color: #008542 !important;
    box-shadow: 0 -4px rgb(21 108 0 / 50%) inset,
        0 4px rgb(100 253 31 / 99%) inset, -4px 0 rgb(100 253 31 / 50%) inset,
        4px 0 rgb(21 108 0 / 50%) inset;
}

button:after {
    position: absolute;
    pointer-events: none;
    top: 0;
    left: 0;
    display: block;
    width: 100%;
    height: 100%;
    content: "";
    box-shadow: 0 4px 0 0 rgb(0 0 0 / 15%);
    transition: 0.7s cubic-bezier(0, 0.8, 0.26, 0.99);
}

button:hover:before {
    box-shadow: 0 -4px rgb(0 0 0 / 50%) inset, 0 4px rgb(255 255 255 / 20%) inset,
        -4px 0 rgb(255 255 255 / 20%) inset, 4px 0 rgb(0 0 0 / 50%) inset;
}

button:hover:after {
    box-shadow: 0 4px 0 0 rgb(0 0 0 / 15%);
}

button:active {
    transform: translateY(4px);
}

button:active:after {
    box-shadow: 0 0px 0 0 rgb(0 0 0 / 15%);
}