Book css

.container {
display: flex;
border: 3px solid;
border-radius: 10px;
width: 70%;
margin: auto;
flex-direction: column;
align-self: center;
padding-top: 20px;
padding-bottom: 60px;
background-color: rgb(167, 163, 159);
}
h1{
font-weight: bold;
font-size: 50px;
margin-bottom: 60px;
}
.container h1,
.container form {

text-align: center;
font-family: "Ubuntu", sans-serif;

}
#pay{
background-color: rgb(84, 84, 148);
}
.container form {
text-align: center;
}
label {
font-size: large;
}
.container form input,select {
text-align: center;
width: 50%;
padding: 10px;
margin: 5px auto;
font-size: 20px;
border: 1px solid gray !important;
border-radius: 9px;
font-family: "Ubuntu", sans-serif;
}
.container button {
width: 50%;
margin: 5px auto;
border-radius: 9px;
}
.btn {
background-color: black;
color: white;
border-radius: 6px;
border-color: white;
font-size: 18px;
font-family: "Rubik Gemstones", cursive;
cursor: pointer;
margin: 15px 6px;
padding: 6px 9px;
}

.btn:hover {
background-color: rgb(50, 49, 49);
}