.header {
    padding: 12px;
    text-align: center;
    background: #3a5b3f;
    color: white;
    font-size: 28px;
    margin: 0;
}

.grid-container {
    display: -ms-flexbox;
    display: flex;
    -ms-flex-wrap: wrap;
        flex-wrap: wrap;
    -ms-flex-direction: row;
        flex-direction: row;
    padding: 10px;
}
.grid-item {
    -ms-flex-preferred-size: 0;
        flex-basis: 0;
    -ms-flex-positive: 1;
        flex-grow: 1; 
    max-width: 100%;
    min-width: 300px;
    padding: 5px;
    font-size: 30px;
    text-align: left;
}

a.btn1 {
    background: #fff;
    border: 1px solid #ccc;
    box-shadow: 10px 10px 0 -2px rgba(217, 217, 217, 1);
    color: #333 !important;
    font-size: 18px !important;
    margin-bottom: 12px;
    padding: 15px 10px;
    text-align: left;
    width: 91%;
    display: block;
    overflow: hidden;
	text-decoration: none;
}
a.btn1:hover {
    background-color: darkgray;
}
  
a.btn1:active {
    box-shadow: none;
    top: 5px;
}