html {
    background: url(/Content/themes/bg.jpg) no-repeat center center fixed; 
    background-size: cover;
    height: 100%;
    overflow: hidden;
}


.cnsd-center-container {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    flex-wrap: wrap;
}

.cnsd-center-box {
    border: 1px solid gray;
    background-color: white;
    padding: 0.5em;
    width: 450px;
}

.cnsd-center-title {
    font-size: 1.5rem;
}

.cnsd-top15 {
    margin-top: 1.5em;
}