style.css

*{
    margin: 0;
    border: 0;
    padding: 0;
    font-family: Verdana, Geneva, Tahoma, sans-serif;
}

body {
    display: flex;
    justify-content: center; 
    align-items: center;                
}

span{
    margin-top: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 15px;
    color: green;
}

.conteudo-principal{
    background-color: #ffffff;
    height: 100%;
}

.form-conteudo{
    margin-top: 70px;
    background-color: #dcdbdb;
    width: 400px;
    height: 530px;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 10px 10px 2px rgba(0, 0, 0, 0.2);
}

.campo-form{
    display: flex;
    margin-bottom: 30px;
    display: grid;
}

.campo-form label{
    font-size: 20px;
}

.campo-form input {
    margin-top: 10px;
    height: 30px;
    border-radius: 5px;
    padding-left: 10px;
    border: 1px solid #ccc;
    outline: none;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.campo-form input:focus {
    border-color: #444a4f;
}

.campo-form input:hover {
    background-color: rgb(230, 230, 230);
}

.form-conteudo h1{
    text-transform: uppercase;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 10px;
    margin-bottom: 15px;
    font-weight: 500;
    text-shadow: 5px 5px 3px rgba(0, 0, 0, 0.2);
}

/*! BTN */

.btn{
   width: 100%;
}

.btn button{
    width: 197px;
    height: 60px;
    border-radius: 5px;
    font-size: 15px;
    text-transform: uppercase;
    cursor: pointer;
}

.btn-enviar{
    background-color: rgb(133, 205, 133);
    transition: background-color 0.3s ease;
}

.btn-enviar:hover{
    background-color: rgb(105, 205, 105);
}

.btn-cancelar{
    background-color: rgb(227, 138, 138);
    transition: background-color 0.3s ease;
}

.btn-cancelar:hover{
    background-color: rgb(222, 72, 72);
}