.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    grid-gap:20px;
}

@media only screen and (max-width: 600px) {
    .grid-container {
        grid-template-columns: repeat(1, minmax(100px, 1fr));
        grid-gap:0px;
    }
}

.form-group label {
    display: block;
    font-weight: bold;
    margin-bottom: 5px;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100% !important;
    padding: 8px !important;
    font-size: 18px !important;
    border: 1px solid #ccc !important;
    border-radius: 4px !important;
    min-height: 40px;
    font-weight: 600;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    background-color: #fff !important;
}

.form-group input.text-center {
    text-align: center;
}

span#narrow_test_date {
    font-size: 20px;
    font-weight: 600;
    margin-top: 5px;
    display: block;
}

.grid-container button.btn {
    display: block;
    width: 100%;
    border-radius: 0px;
}

.grid-container button.btn.calc_reset {
    background-color: #aaa;
}