start.css

@-webkit-keyframes typing { from { width: 0; } }
@-webkit-keyframes blink-caret { 50% { border-color: transparent; } }

.purle{
color: #57d131; /* text color + color overlay */
font-family: 'Source Code Pro', monospace;
font-size: 15.9vw;
font-size: 15.9vh;
margin: auto;
border-right: .05em solid #57d131;
width: 29.5em;
width: 5ch;
margin-bottom: 2em;
margin-top: 2em;
white-space: nowrap;
overflow: hidden;
-webkit-animation: typing 1.5s steps(5, end),
blink-caret .5s step-end infinite alternate;
-webkit-user-select: none;
}

body{
  overflow:hidden;
  background-color: #f0feee;
}
button{
-webkit-user-select: none;
margin:auto;
width: 27vw;
height: 10vh;
-moz-border-radius: 36px;
-webkit-border-radius: 36px;
border-radius: 36px; /* border radius */
-moz-background-clip: padding;
-webkit-background-clip: padding-box;
background-clip: padding-box; /* prevents bg color from leaking outside the border */
background-color: #57d131; /* layer fill content */

border: 0;
border-style: solid;
outline: none;
}

button:active{
  background-color: #51ba30;
}
.text{
-webkit-user-select: none;
color: #fff; /* text color */
font-family: 'Source Code Pro', monospace;
font-size: 5vw;
font-size: 5vh;
}