a.button21 {
    display: inline-block;
    width: auto;
    height: auto;
    margin-bottom: 10px;
    margin-top: 10px;
    margin-left: 20px;
    padding-left: 5px;
    padding-right: 5px;
    line-height: 2em;
    vertical-align: middle;
    text-align: center;
    text-decoration: none;
    user-select: none;
    color: rgb(255, 255, 255);
    font-weight: 500;
    outline: none;
    border: 1px solid #2391ba;
    border-top-color: #2391ba;
    border-radius: 0px;
    background: #2391ba;
    box-shadow: -1px 1px 3px rgba(0, 0, 0, 0.5);
    transition: .2s ease-in-out;
}
a.button21:hover:not(:active) {
    border: 2px solid #2391ba;
    color: #2391ba;
    background: #fff;

}
a.button21:active {
    color: rgb(226,69,69);
    background: rgb(255,255,255);
    box-shadow: -2px 2px 4px rgba(0, 0, 0, 0.5);
font-weight: 500;
}