Cricket Beginner

hello

body{
background-size:53vh 70vw;
background-image:url(“bookreadingbg.jpg”);
background-repeat:no-repeat;
background-color:black;
}
nav{
background-color:black;
display:flex;
position:fixed;
border:2px solid silver;
border-radius:3px;
height:50px;
width:100%;
z-index:+5;
}
nav img{
display:inline-block;
position:relative;
height:40px;
filter:invert(70%);
margin:5px;
}
nav ul li{
display:inline-block;
position:relative;
list-style-type:none;
margin-left:10px;
}
nav ul li a{
text-decoration:none;
color:white;
padding:5px;
}
nav ul li a:hover{
background-color:white;
color:black;
font-famiy:arial;
}
#org{
font-style:italic;
font-weight:bold;
font-size:20px;
margin-right:20px;
margin-left:1px;
}
#org a{
color:orange;
}
firstbl{
display: inline-block;
position: relative;
height:600px;
width:100%;
margin-top:700px;
}
firstbl form{
color:white;
border:5px solid white;
position:absolute;
display: inline-block;
width:100%;
height:600px;
}
firstbl form{
text-align:center;
}
form p{
text-align:center;
font-size:50px;
}
firstbl form input{
position: relative;
display:block;
width:50%;
border-radius:10px;
text-align:center;
margin:auto;
margin-top:30px;
height:30px;
font-size:30px;
}
firstbl form button{
height:50px;
width:30%;
margin:30px;
border-radius:20px;
font-size:30px;
color:white;
background:black;
border:2px solid silver;
}
secondbl{
background-image:url(“bookbg.jpg”);
background-repeat:no-repeat;
background-size:50% 100%;
background-color:rgb(180,90,0);
display: inline-block;
position: relative;
border:2px solid white;
height:500px;
width:100%;
margin-right:20px;
margin-top:20px;
color:black;
font-weight:bold;
}
secondbl p{
text-align:center;
font-size:45px;
font-family:arial;
margin-left:50%;
margin-top:150px;
}
video{
display: inline-block;
position: relative;
border:2px solid black;
height:500px;
width:100%;
margin-top:10px;
}
thirdbl{
background-color:rgb(180,90,0);
border-radius:20px;
display: inline-block;
position: relative;
border:2px solid black;
height:250px;
width:100%;
margin-top:10px;
font-size:20px
}
thirdbl{
display:flex;
position: relative;
}

thirdbl ul{
color:black;
padding-left:20px;
height:300px;
}
thirdbl ul li{
font-famiy:arial;
text-align:left;
margin-left:50px;
text-decoration:none;
}
.h{
list-style-type:none;
}
thirdbl ul a li{
color:black;
}