.prox {
    color: #797979;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 90vh;
}
.btn-no-radius { border-radius: 0; -webkit-border-radius: 0; -moz-border-radius: 0; -ms-border-radius: 0; -o-border-radius: 0; }
.btn-gray {
    color: #FFF;
    background-color: #4C4C4C;
    border: 1px solid #4C4C4C;
}
.btn-gray:hover,
.btn-gray:active,
.btn-gray:focus {
    color: #FF5800;
    border-color: #FF5800;
}