.error404-content {
    margin: 3rem auto;
    text-align: center;
    min-height: 50vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.error404-nav {
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
}

@media only screen and (max-width: 640px) {
    .error404-nav {
        flex-direction: column;
    }
}

.error404-content h2 span {
    color: #16879a;
}

.error404-btn {
    color: #fff;
    text-decoration: none;
    background: #16879a;
    border: none;
    letter-spacing: 1px;
    width: 20%;
    min-width: 70px;
    max-width: 100px;
}

.error404-nav .probox {
    border-radius: initial!important;
}

.is-fixed {
    position: fixed;
    bottom: 0;
    width: 100%;
}