.container {
    display: -webkit-box;
    display: -moz-box;
    display: -ms-flexbox;
    display: -webkit-flex;
    display: flex;
    align-items: center;
    justify-content: center;
}
.row {
    display: flex; 
    align-items: center; 
    justify-content: center;
    flex-direction: column;
}
.center {
    display: flex;
    align-items: center;
    justify-content: center;
}
#reset-button{
    background-color: whitesmoke;
    border: 1px solid black;
    border-radius: 15px;
    -webkit-border-radius: 15px;
    -moz-border-radius: 15px;
    -ms-border-radius: 15px;
    -o-border-radius: 15px;
    color: #3c4043;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 14px;
    margin: 11px 4px;
    padding: 0 16px;
    line-height: 27px;
    height: 36px;
    min-width: 54px;
    text-align: center;
    cursor: pointer;
    user-select: none;
}
#reset-button:hover{
    box-shadow: 0 0 8px rgba(33,33,33,.2);
}
.grid {
    display: grid;
    grid-template-columns: auto auto auto;
    background-color: black;
    padding: 2px;
}
.grid-element {
    background-color: whitesmoke;
    border: 1px solid black;
    padding: 20px;
    font-size: 30px;
    text-align: center;
  }