body{
    font-family: Arial, Helvetica, sans-serif;
    line-height: 1.6;
    margin: 20px;
    background-color: #eef4ff;
}
.main-header{
    background-color: #111;
    color: #fff;
    text-align: center;
    padding: 15px;
    font-size: 25px;
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: lowercase;
    position: sticky;
    top: 0;
    margin: 0 auto;
    max-width: 580px;
}
h2{
    color: #4a90e2;
}
.btn{
    display: inline-block;
    padding: 5px 20px;
    margin: 10px 5px 0 0;
    background-color: #4a90e2;
    color: #fff;
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
    border: 1px solid #333;
    transition: 0.5s;
}
.btn:hover{
    background-color: #357abd;
    transform: scale(1.05);
}
input[type="checkbox"] {
    margin-right: 8px;
}
.container{
    max-width: 550px;
    margin: 20px auto;
    background-color: #fff;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 5px 20px rgba(0,0,0,08);
}
.container label{
    display: block;
    margin-top: 15px;
    font-weight: bold;
}
.container input, select{
    width: 100%;
    padding: 10px;
    margin-top: 5px;
    border-radius: 5px;
    border: 1px solid #ccc;
    box-sizing: border-box;
}
.button-group{
    display: flex;
    justify-content: space-between;
    margin-top: 20px;
}