html, body {
    display: flex;
    justify-content: center;
    height: 100%;
    }
    body, div, h1, form, input, p { 
    padding: 0;
    margin: 0;
    outline: none;
    font-family: Roboto, Arial, sans-serif;
    font-size: 16px;
    color: #666;
    }
    ::placeholder { 
        padding: 0;
        margin: 0;
        outline: none;
        font-family: Roboto, Arial, sans-serif;
        font-size: 14px;
        color: #666;
    }
    h1 {
    padding: 10px 0;
    font-size: 32px;
    font-weight: 300;
    text-align: center;
    }
    p {
    font-size: 12px;
    }
    hr {
    color: #a9a9a9;
    opacity: 0.3;
    }
    .main-block {
    max-width: 300px;    /* 340   310 */
    min-height: 400px;     /*460 410*/ 
    padding: 10px 0;
    margin: auto;
    border-radius: 5px; 
    border: solid 1px #ccc;
    box-shadow: 1px 2px 5px rgba(0,0,0,.31); 
    background: #ebebeb; 
    }
    form {
    margin: 0 30px;
    }
    .account-type, .gender {
    margin: 15px 0;
    }
    input[type=radio] {
    display: none;
    }
    label#icon {
    margin: 0;
    border-radius: 5px 0 0 5px;
    }
    label.radio {
    position: relative;
    display: inline-block;
    padding-top: 4px;
    margin-right: 20px;
    text-indent: 30px;
    overflow: visible;
    cursor: pointer;
    }
    label.radio:before {
    content: "";
    position: absolute;
    top: 2px;
    left: 0;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #1c87c9;
    }
    label.radio:after {
    content: "";
    position: absolute;
    width: 9px;
    height: 4px;
    top: 8px;
    left: 4px;
    border: 3px solid #fff;
    border-top: none;
    border-right: none;
    transform: rotate(-40deg);   /* (-45deg); */
    opacity: 0;
    }
    input[type=radio]:checked + label:after {
    opacity: 1;
    }

    input[type=text] {     /* input[type=text], input[type=password] {   */
    width: calc(100% - 57px);
    height: 36px;
    margin: 13px 0 0 -5px;
    padding-left: 10px; 
    border-radius: 0 5px 5px 0;
    border: solid 1px #cbc9c9; 
    box-shadow: 1px 2px 5px rgba(0,0,0,.09); 
    background: #fff; 
    }
    /*
    input[type=password] {
    margin-bottom: 15px;
    }
    */

    #icon {
    display: inline-block;
    padding: 9.3px 15px;
    box-shadow: 1px 2px 5px rgba(0,0,0,.09); 
    background: #1c87c9;
    color: #fff;
    text-align: center;
    }
    .btn-block {
    margin-top: 10px;
    text-align: center;
    }

    button {
    width: 100%;
    padding: 10px 0;
    margin: 10px auto;
    border-radius: 5px; 
    border: none;
    background: #1c87c9; 
    font-size: 14px;
    font-weight: 600;
    color: #fff;
    }

    button:hover {
    background: #26a9e0;
    }
    
    #auswertung { 
     
        width: 1px;
        height: 1px; 
        margin-top: 20px;
        padding-top: 20px;
        padding-bottom: 0;  
        border: none;
        font-size: 1px;
        color: inherit;
        /* font-weight: 600;         
        color: #bbb9b9;
        */  
       
        }


    input[type="datetime-local"] { 
        width: calc(100% - 63px);       
        height: 36px;
        margin: 10px auto;                  /*13px 0 0 -5px;*/
        padding-left: 10px; 
        border-radius: 0 5px 5px 0;
        border: solid 1px #cbc9c9; 
        box-shadow: 1px 2px 5px rgba(0,0,0,.09); 
        background: #fff;   
        /* font-size: inherit;
        font-size: 0.1em;
        */
        
        }

    /*Eine fehlerhafte Eingabe:*/
    input:invalid{
         color:red;
        }