style.css

*{
    margin:0;
    padding:0;
    box-sizing: border-box;
    font-family: Arial, Helvetica, sans-serif;
}
body{
    background-color: #F2C185;
    height: 100vh;
    display: flex;
    align-items: center;
    flex-direction: column;

    justify-content: center;
}
header{
        height: 70px;
}
header h1{
    text-align: center;
    color:#048ABF;
}
main form{
    min-width: 350px;
    max-width: 450px;
    min-height: 350px;
    max-height: 450px;
    border-radius: 30px;
    border: 2px solid #BF7F5A; 
    background-color: #243A65;
    color:white;
    /* posicionamento */

    display: flex;
    flex-direction: column;
    padding:40px 30px;
    flex-wrap: nowrap;
}
input{
    outline: none;
    border:none;
}
input[type="text"],input[type="number"]{
font-size: 17px;
margin-block:8px;
padding: 5px;
}
#idade,#numero{
    width: 190px;
}
#sexo{
    width: 100px;
    padding: 5px;
}
#inline{
    display: flex;
    gap: 3px;
    justify-content: space-between;
}
#inline .em_cima{
    display: flex;
    flex-direction: column;
}
label{
    margin-top:8px;
}

form input[type="submit"]{
    align-self: center;
} 
input[type="submit"]{
    margin-top:20px;
    padding: 10px;
    width: 200px;
    border-radius: 16px;
    font-size: 12pt;
    font-weight: 500;
    background-color: #048ABF;
    color: white;
}
input[type="submit"]:hover{
    background-color: white;
    color: #048ABF;
}