body,ul,li,p,h1,h2,#div1,.class1{
            margin-top: 0;
            padding: 0;
        }
li{
    font-size: 30px;
}

.red{
    color: red;
}
.greenBg{
    background-color: rgba(0,255,0,0.5);
}
.align-center{
    text-align: center;
}
.size24 {
    font-size: 24px;
}
.div1{
    background-color: red;/*背景颜色*/
    /* 全部样式 发生改变时 改变的样式在0.5秒内实现(不是马上实现) */
    transition: all 0.5s; /*过渡:发生过渡的样式(全部)   完成过渡的时间ms/s*/
}
/* 匹配class='div1'的元素 鼠标移入时的状态 */
.div1:hover{
    background-color: blue;
}
.table-size1{
    width:600px;
    height:520px;
    bgcolor:aqua;
}
.table-size2{
    width:600px;
    height:900px;

}
.bg img{
	position: fixed;
	top:0;
	width: 100%;
	height:100%;
	opacity: 0.6;
	z-index: -100;
}
form p{
    background-color: rgba(148,255,0,0.2);
    text-align: center;
    font-size: large;

}
form button{
    font-size: larger;
}

input{
     font-size: 20px;
}