.square_btn {
    display: inline-block;
    padding: 0.4em 1.2em;
    text-decoration: none;
    color: #67c5ff;
    border: solid 2px #67c5ff;
    border-radius: 3px;
    transition: .4s;
    font-size:0.9em
}

.square_btn:hover {
    background: #67c5ff;
    color: white;
}