body{
    background-image:url(./下載.jpg);
    background-repeat: no-repeat;
}

.title-1{
    color:blue;
    font-size: 30px;
        }
.title-2{
    color: red;
    font-size: 20px;
}
.text{
    color:aqua;
    background-color: blueviolet;
    opacity:50%;
}
.yyy{
    font-size: 30px;
    font-weight: bold;
    font-family: Arial, Helvetica, sans-serif;
    text-align: center;
    line-height: 5;
    text-decoration: underline;
}
.range{
    width: 300;
    height: 200;
    border: 2px solid black;
    padding: 50px;
    margin: 50px 0;
}
.btn{
    background-color: blue;
    border: none;
    color: aliceblue;
    border-radius: 5px;
}