header a,
header button,
footer a {
    color: inherit;
    text-decoration: none;
    border: none;
    background: none;
    width: auto;
}

    header a:hover,
    .footer a:hover {
        border: inherit;
        background-color: inherit;
    }

a,
button {
    display: block;
    color: black;
    text-decoration: none;
    border: 2px solid black;
    background-color: transparent;
    width: 15%;
    text-align: center;
    margin: 5px 2px;
}

a:hover,
button:hover {
    color: black;
    border: 2px solid black;
    background-color: grey;
}

#authform {
    width: 100%;
    border: 2px solid black;
}

form label,
form span {
    margin-left: 5px;
}

form input {
    margin: 0 5px;
    width: 98% !important;
}

@media (max-width: 426px) {
   form a,
   form button {
        width: 100%;
    }
}