body{
    margin: 0;
    padding: 0;
    background-color: #fbfbfb;
}

a{
    text-decoration:none;
    color: black;    
}

#nav-bgc{
    width: 100%;
    position: fixed;
    z-index: 9999;     
    background-color: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(6px);
    transition: background-color 0.5s ease;
}

.nav{
    min-width: 1405px;
    max-width: 1920px;
    width: 100%;
    margin: 0 auto;       
    height: 110px;
}

.nav #logo{
    width: 150px;
    position: relative;
    top: 35px;
    left: 9.3%;
}

.nav>ul{
    float: right;
    position: relative;
    top: 25px;
    right: 3.1%;
    width: 1000px;
}

.nav>ul li{
    padding: 0 15px;
    display: inline-block;
    vertical-align: top;    
}

.nav>ul li a{
    color: #333;    
    transition: all 0.2s ease;
}

.nav>ul li a:hover{
    font-weight: bold;
}

#login-box{
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    top: -5px;
}

#login-button{
    width: 155px;
    padding: 7px 10px;
    border: solid 1px #333;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50px;
    transition: all 0.2s ease;
}
#login-button:hover{
    cursor: pointer;
    background-color: #0071e3;
    border-color:#0071e3 !important ;
    color: #fff;
}

.islogin #login-button{
    visibility: hidden; 
}

.nav-login-img{
    width: 30px;
    margin-left: 30px;
    transition: all 0.2s ease;
}

.nav-login-img:hover{
    cursor: pointer;
    width: 32px;
    margin-left: 28px;
}

#sub-menu{
    margin: 0;
    padding: 0;
    padding-top: 15px;
    padding-bottom: 15px;
    width: 150px;
    position: absolute;
    top: 80px;
    right: 45px;
    background-color: #fff;
    border-radius: 20px;
    visibility: hidden;
    z-index: 999;
    transition: all 0.2s ease;
}

#sub-menu ul li{
    margin: 0;
    padding: 0;
    margin-top: 12px;
    margin-bottom: 12px;
}

.nav-is-white .nav>ul>li #sub-menu a{
    color: #333;
    transition: none;
}
.nav-is-white{
    background-color: rgba(255, 255, 255, 0) !important;
    backdrop-filter: none !important;
    
}
.nav-is-white .nav>ul li a{
    color: #fff;
}
.nav-is-white .nav>ul li #login-box #login-button{
    border-color: #fff;
    color: #fff;
}

#exit,.nav-is-white .nav>ul>li #sub-menu #exit{
    color: #ff433e;
}




.flex-container{
    margin: 0 auto;
    min-width: 960px;
    max-width: 1920px;
    width: 100%;
    display: flex;
    flex-flow:column nowrap;
    justify-content: center;
    align-items: baseline;    
}
.flex-item{
    position: relative;
}

.flex-item img{
    width: auto\9;
    width: 100%;
    height: auto;
    display: grid;
}

.flex-item .download-button{
    width: 20%;
    position: absolute;
    top: 27%;
    left: 39.5%;
}