.semi-transparent-button {
    display: block;
    box-sizing: border-box;
    margin: 0 auto;
    padding: 10px;
    max-width: 175px;
    background: #fff; /* fallback color for old browsers */
    background: rgba(255, 255, 255, 0.8);
    /*border-radius: 8px;*/
    color: black;
    text-align: center;
    text-decoration: none;
    font-size: 18px;
    font-family: Montserrat, sans-serif;
    letter-spacing: 1px;
    transition: all 0.3s ease-out;
    z-index: 9999;
}

@media (max-width: 500px) {
    .semi-transparent-button {
        max-width: 160px !important;
        font-size: 15px !important;
    }
}