html, body {
  border: 0;
  padding: 0;
  margin: 0;
  height: 100%;
}

body {
  background: tomato;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 16px;
}


@media screen and (max-width: 768px) {

    form {
       
        width: 80% !important;
    }
    }
    form {
        background: white;
        width: 40%;
        box-shadow: 0px 0px 20px rgba(0, 0, 0, 0.7);
        font-family: lato;
        position: relative;
        color: #333;
        border-radius: 10px;
    }

        form header {
            background: #FF3838;
            padding: 30px 20px;
            color: white;
            font-size: 1.2em;
            font-weight: 600;
            border-radius: 10px 10px 0 0;
        }

        form label {
            margin-left: 20px;
            display: inline-block;
            margin-top: 30px;
            margin-bottom: 5px;
            position: relative;
        }

            form label span {
                color: #FF3838;
                font-size: 2em;
                position: absolute;
                left: 2.3em;
                top: -10px;
            }

        form input {
            display: block;
            width: 78%;
            margin-left: 20px;
            padding: 5px 20px;
            font-size: 1em;
            border-radius: 3px;
            outline: none;
            border: 1px solid #ccc;
        }

        form .help {
            margin-left: 20px;
            font-size: 0.8em;
            color: #777;
        }

        form button {
            position: relative;
            margin-top: 30px;
            margin-bottom: 30px;
            left: 50%;
            transform: translate(-50%, 0);
            font-family: inherit;
            color: white;
            background: #FF3838;
            outline: none;
            border: none;
            padding: 5px 15px;
            font-size: 1.3em;
            font-weight: 400;
            border-radius: 3px;
            box-shadow: 0px 0px 10px rgba(51, 51, 51, 0.4);
            cursor: pointer;
            transition: all 0.15s ease-in-out;
        }

            form button:hover {
                background: #ff5252;
            }