html, body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
}

.app {
    width: 100%;
    height: 100%;
}

.w-100 {
    width: 100%;
}

.h-100 {
    height: 100%;
}

.w-h-100 {
    width: 100%;
    height: 100%;
}

.header-center {
    display: flex;
    align-items:center;
}

.h-center {
    display: flex;
    align-items:center;
}

.t-h-center {
    display: flex;
    justify-content: center;
    align-items:center;
}

.header-link {
    text-decoration: underline;
}