.square_btn {
    display: inline-block;
    padding: 0.5em 1.5em;
    text-decoration: none;
    color: #388E3C;
    border: solid 2px #388E3C;
    border-radius: 3px;
    transition: .4s;
    
    margin: 0.5em auto;
}

.square_btn:hover {
    background: #388E3C;
    color: white;
}

.square_btn2 {
    display: inline-block;
    padding: 1.5em 1.5em;
    text-decoration: none;
    color: #388E3C;
    border: solid 2px #388E3C;
    border-radius: 3px;
    transition: .4s;

    margin: 1em auto;
}

.square_btn2:hover {
    background: #388E3C;
    color: white;
}