body {
     font-family: Arial, Helvetica, sans-serif;
     font-size: 20px;
     padding: 0 20px 30px 0;
     line-height: 1.4;
}
.flex-container {
     margin-top: 20px;
     display: flex;
     flex-wrap: nowrap;
     width: 100%;
     height: 500px;
     justify-content: center;
     transition: 2s all ease;
}

.flex-item {
     background: cyan;
     border: 1pt solid black;
     width: 10px;
     transition: 0.1s all ease;
}

.row {
     display: grid;
     grid-template-columns: 1fr 1fr 2fr;
}

#input {
     display: flex;
     padding: 10px;
     justify-content: space-around;
}