.button-nat {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    width: 400px;
    margin:2em  auto;
    padding: .9em 2em;
    overflow: hidden;
    border: 1px solid #dcaa5e;
    border-radius: 5px;
    background-color: #fff;
    color: #dcaa5e;
    font-size: 1.1em;
    font-weight: bold;
}

.button-nat:hover {
    background-color: transparent;
    color: #fff;
}

.button-nat::before {
    position: absolute;
    z-index: -1;
    transform: rotate(-30deg);
    width: 100%;
    height: 0;
    border-radius: 5px;
    background-color: #dcaa5e;
    content: '';
    transition: height .3s ease;
}

.button-nat:hover::before {
    height: 350%;
}

.button-nat::after {
    transform: rotate(45deg);
    width: 5px;
    height: 5px;
    margin-left: 10px;
    border-top: 2px solid #dcaa5e;
    border-right: 2px solid #dcaa5e;
    content: '';
}

.button-nat:hover::after {
    border-color: #fff;
}