html {
    height: 100;
    width: 100;
}

body {
    font-family: Arial, Helvetica, sans-serif;
}

.container {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
}

.spark {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}
button {
    width: 50%;
    height: auto;
    background-color: transparent;
    border: none;
}
.spark_img {
    width: 50%;
    height: auto;
    cursor: pointer;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

button:active {
  width: 48%;
}