.c_Body{
    width: 100vw;
    height: 100vh;
    margin: 0;
    background-color: black; /*transparent;*/
    overflow-x: hidden;
    overflow-y: visible;
    -webkit-user-select: none;
    overflow: hidden;
}
.c_MainTitle{
    position: absolute;
    color: white;
    font-size: 6vh;
    width: 100%;
    height: 6vh;
}
.c_MainDemo{
    position: absolute;
    width: 90vw;
    left: 5vw;
    top: 6vh;
    height: 79vh;
    margin: 0;
    background-color: transparent;
    border-width: 0;
}

.c_AdFooter{
    position: absolute;
    width: 100%;
    top: 85%;
    height: 15%;
    background-color: black;
}

.c_AdFooter_Content{

}

/* Flex */
.c_Flex{
    display: -webkit-flex;
    display: flex;
}
.c_Flex_Row{
    display: -webkit-inline-flex;
    display: inline-flex;
    -webkit-flex-direction: row;
    flex-direction: row;
}
.c_Flex_Col{
    display: -webkit-inline-flex;
    display: inline-flex;
    -webkit-flex-direction: column;
    flex-direction: column;
}
.c_Flex_VCenter{
    -webkit-align-items: center;
    align-items: center;
}
.c_Flex_HCenter{
    -webkit-justify-content: center;
    justify-content: center;
}
.c_Flex_Center{
    -webkit-align-items: center;
    align-items: center;
    -webkit-justify-content: center;
    justify-content: center;
}
.c_Flex_VEnd{
    -webkit-align-items: flex-end;
    align-items: flex-end;
}
.c_Flex_HEnd{
    -webkit-justify-content: flex-end;
    justify-content: flex-end;
}
.c_Flex_SpaceAround{
    -webkit-justify-content: space-around;
    justify-content: space-around;
}
.c_Flex_SpaceBetween{
    -webkit-justify-content: space-between;
    justify-content: space-between;
}