.button_big {
    display: inline-block;
    height:60px;
    width: 350px;
    margin:1em 1em 1em 0;
    line-height:60px;
    background-color : var(--main-bg-color);
    color:black;
    border-radius:30px;
    box-shadow: 2px 2px 4px gray;
    font-size: 18pt;
    font-weight: bold;
    text-decoration:none;
    text-align:center;
}
.button_big:hover {
}
.button_back {
    color:white;
    background-color : black;
}
.button_red {
    color:white;
    background-color : #e63082;
}

@media screen and (max-width: 900px) {
    .button_big {
        margin:0.5em 0 0.5em 0;
        width: 90%;
        font-size: 16pt;
    }
}
@media screen and (max-width: 450px) {
    .button_big {
        margin:0.5em 0 0.5em 0;
        width: 100%;
        font-size: 14pt;
    }
}