body{
    background-color: rgb(225, 233, 233);
    color: black;
}
.x{
    margin: 0;
    background-color: grey;
}
.x ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    
}

.x li {
    float: left;
    margin: 0 7px;
}

.x li a {
    display: block;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
}

.x li a:hover {
    background-color: #111;
}
.y{
    background-color: white;
    width: 60%;
    margin-top: 8px;
    margin-left: 70px;
    border-radius: 6px;
    text-align: center;
}
.z{
    background-color: gray;
    width: 95%;
    border-radius: 2px;
    text-align:left;
    margin: auto;
}
.bu{
    padding: 20px;
    background-color: white;
    text-align: center;
}
.right-x{
    float: right;
    margin-right: 10%;
    margin-left: 10%;
    border:10px solid white;
    width: 300px;
    height: 600px;
}
.a{
    background-color: white;
    width: 80%;
    height: 1000px;
    border-radius: 9px;
    margin: auto;
}
.download{
    margin: 20px;
    background-color: rgb(190, 190, 193);
    width: 400px;
    border-radius: 5px;
    float: left;
}
.block{
    width: 380px;
    margin: 10px;
    float: left;
    background-color: gainsboro;
}
.block:hover{
    background-color: ghostwhite;
}
.block-LunTan{
    margin: 20px;
    background-color: rgb(217, 216, 210);
    width: 90%;
    border-radius: 5px;
    float: left;
}
.block-LunTan:hover{
    background-color: rgb(176, 174, 173);
}
.block-LunTan h6{
    color: grey;
}