[Bug] Formulario nao responsivo

body {
    border: 0%;
    background-image: url(../Imagens/Scania2.jpg);
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
    justify-content: center;
    align-items: center;
    height:auto;
    overflow-x: hidden;
    perspective: 2px;
    position: absolute;
    transform-style: preserve-3d;
    flex-direction: column;
    background-attachment: fixed;
}

@import url('https://fonts.cdnfonts.com/css/north');


#Menu ul {
    transition: 2s;
    float: right;
    font-size: 25px;
    max-width: 1500px;
    list-style-type: none;
    padding: 0;
    background-color: rgba(255,255,255,0);
    font-family: 'North', sans-serif;
    display: inline-flex;
}


#Menu ul li {
    display: inline;
    list-style-type: none;
    margin: 0 1em;
}

#Menu ul Li a {
    color: black;
    padding: 20px;
    text-decoration: none;
    display: inline-block;
    transition: background .6s;
    border-radius: 40px;
}

#Menu ul li a:hover {
    background-color: rgb(255, 255, 255);
}

.container_form {

    width: 750px;
    position: fixed;
    margin: 65%;
    display: flex;
    flex-direction: column;
    background:#ffffff; 
    box-shadow: 2px 2px 1.2px 0px #e3e3e3; 
    border-radius:30px; 
    opacity: 70%;
    padding:5em;
}
.container_form h1 {

    font-family:'North', sans-serif;
    font-size: 1.5em;
    text-align: center;
    color: #000000;
    border-bottom: 1px #f0eded solid;
    margin-bottom: 10px;

}
.form_grupo {

    font-size: small;
    width: 90%;
    margin: 0 auto;
    margin-bottom: 30px;
    position: relative;
    font-family: 'North', sans-serif;
}
.form_grupo .legenda { 
    width: 100%;
    float: left;
    margin-top: 15px;
    margin-bottom: 15px;
    font-weight: bold;
}
/* SUBMIT */
.submit { width:100%; float:left; }
.submit_btn {
    float: center;
    display: block;
    padding: 25px 50px;
    border: none;
    outline: none;
    background-color: rgb(255, 0, 0);
    color: rgb(255, 255, 255);
    font-family: 'North', sans-serif;
    font-size: 20px;
    font-family:'North', sans-serif;
    border-radius: 30px;
    margin: 20px auto;
    cursor: pointer;
    transition: all 0.3s;
}
.submit_btn:hover {
    background-color: rgb(0, 0, 255);
    transform: scale(1.03);
}
.dropdown {
    display: block;
    margin: 0 auto;
    font-size: 20px;
    font-family: 'North', sans-serif;
    color: #222222;
    border-radius: 4px;
    border: 1px #f2f2f2 solid;
    background: #fdfdfd;
    outline: none;
    padding-left: 10px;
    width: 100%;
}
.form_new_input {
    display: none;
}
.radio_label,
.check_label {
    float: left;
    width: 100%;
    padding-left: 30px;
    cursor: pointer;
    margin-bottom: 8px;
}
.radio_new_btn {
    position: absolute;
    left: 0;
    transform: translateY(3px);
    height: 20px;
    width: 20px;
    border-radius: 50%;
    border: 0.2em solid #4c4c4c;
}
.radio_new_btn::after {
    content: "";
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: #6fcffb;
    visibility: hidden;
}
.check_new_btn {
    position: absolute;
    left: 0;
    height: 20px;
    width: 20px;
    border: 0.2em solid #4c4c4c;
}
.check_new_btn::after {
    content: "";
    height: 8px;
    width: 8px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #6fcffb;
    visibility: hidden;
}
.form_new_input:checked ~ .radio_label .radio_new_btn::after,
.form_new_input:checked ~ .check_label .check_new_btn::after {

    visibility: visible;
}
.form_new_input:checked ~ .radio_label,
.form_new_input:checked ~ .check_label {
    color: #6fcffb;
}
.form_grupo {
    width: 100%;
    margin-bottom: 20px;
    position: relative;
}
.form_input {
    font-size: 16px;
    font-family: 'North', sans-serif;
    padding: 8px 15px;
    border-radius: 4px;
    border: 1px #f2f2f2 solid;
    background: #fdfdfd;
    outline: none;
    width: 100%;
    transition: all 0.3s;
}
.form_message,
.form_message .message_input {
    width: 100%;
    float:left;
}
.form_message_label {
    width: 100%;
    float: left;
    margin-top: 15px;
    margin-bottom: 15px;
    font-weight: bold;

}

@media screen and (max-width: 768px) {
    .Menu, .container_form{
        display: block;
    }
    .container_form,.form_grupo,.check-btn,.form_new_input,.submit
.input-padrao {
    width: 100%;
}
}