* {
    margin: 0px;
}
body, html {
    width: 100%;
    height: 100%;
    background-color: black;
    background-image: url(./Pics/bg7.jpg);
    background-size: 1200px 1200px;
    background-position: center;
    background-repeat: no-repeat; 
}

.cont {
    width: 100%;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
}
h1, h2 {
    font-weight: bold;
    font-family: Gabriola, Arial;
    text-align: center
}
h1 {
    color: yellow;    
    font-size: 50px;       
}
h2 {
    color: orange;    
    font-size: 40px;    
}
p {
    color: orangered;
    margin-top: 10px;
    font-weight: bold;
    font-size: calc(12px + 1vw);    
}
li {
    list-style-type: none;
}
.box1 {
    width: 100%;
    height: 85px;   
    text-align: center;      
}
.box2 {
    width: 100%;
    height: 600px;
    float:left;    
}
.box-a {    
    width: 296px;
    text-align: center;
    background-image: url(./Pics/reading.jpg);    
    background-repeat: no-repeat;
    background-size: cover;
    border: 2px solid orangered;        
}
.box-b {    
    width: 600px;
    text-align: center;    
    background-repeat: no-repeat;
    background-size: cover;
    text-align: center; 
}
.box-c {    
    width: 296px;
    text-align: center;
    background-image: url(./Pics/sinfo.jpg);    
    background-repeat: no-repeat;
    background-size: cover;
    border: 2px solid orangered;
}
.box3 {
    width: 100%;
    height: 50px;
    float:left;    
    text-align: center;    
}
.clearfix {
    clear: both;
}
.btn {
    background-color: green;
    border: 0;
    color: white;
    padding: 4px;
    font-size: 12px;
    margin: 4px 15px;
    cursor: pointer;
    border-radius: 10px;
    transition-duration: 0.4s;
    margin-top: 22px;    
}
.btn:hover {
    background-color: blue;
}
.btn2 {
    background-color: green;
    border: 0;
    color: white;
    padding: 5px;
    font-size: 10px;    
    cursor: pointer;
    border-radius: 10px;
    transition-duration: 0.4s;
    margin-top: 10px;
}
.btn2:hover {
    background-color: blue;
}
.btn1 {
    background: none;
    border: 2px solid black;
    color: darkred;
    font-weight: bold;
    padding: 14px;
    font-size: 20px;
    margin: 20px 20px;
    cursor: pointer;
    border-radius: 10px;
    transition-duration: 0.4s;
}
.btn1:hover {
    background-color: lightblue;
}
.btn3 {
    background: none;
    border: 2px solid black;
    color: darkred;
    font-weight: bold;
    padding: 5px;
    font-size: 15px;
    margin: 10px 10px;
    cursor: pointer;
    border-radius: 10px;
    transition-duration: 0.4s;
}
.btn3:hover {
    background-color: lightblue;
}

@media screen  and (max-width: 900px) {
    .box1 {
        width: 100%;
    }
    .box-a {
        width: 100%;
    }
    .box-b {
        width: 100%;
    }
    .box-c {
        width: 100%;
    }  
    .box3 {
        width: 100%;
    }
}
@media screen  and (max-width: 700px) {
    .box1 {
        width: 100%;
    }
    .box2 {
        width: 100%;
    }
    .box3 {
        width: 100%;
    }    
}