@import url('https://fonts.googleapis.com/css2?family=Open+Sans:ital,wght@0,300;0,400;0,600;0,700;0,800;1,300;1,400;1,600;1,700;1,800&display=swap');

* {
    box-sizing: border-box;
    padding: 0; margin: 0;
    
    user-select: none;
    -webkit-user-select: none; /* Chrome/Safari */        
    -moz-user-select: none; /* Firefox */
    -ms-user-select: none; /* IE10+ */
}
html, body {
    font-family: 'Open Sans', sans-serif;
    line-height: 1.8rem;
    font-size: 16px;
}

.dn {
    display: none;
}
.flx {
    display: flex;
}