body {
  margin: auto;
  margin-top: 80px;
  max-width: 560px;
  border-right: 1px solid black;
  border-left: 1px solid black;
  background: #E8FFC9;
  font-family: Arial, Helvetica, sans-serif;
}
body > * {
  margin: auto;
}
body h1 {
  max-width: 320px;
  border-bottom: 2px solid black;
  margin-bottom: 22px;
  font-size: 28px;
}

.litre, .kms, .price {
  width: 50px;
}

.add-row {
  display: block;
  margin: auto;
  margin-top: 10px;
  margin-bottom: 20px;
  background: aqua;
  height: 30px;
  width: 30px;
  border: 1px solid black;
  border-radius: 100%;
  text-align: center;
  cursor: pointer;
}

.odo-helper {
  margin-top: 30px;
  background: yellow;
  border-radius: 6px;
  width: 140px;
  height: 100px;
  text-align: center;
}
.odo-helper p {
  font-size: 16px;
  margin: 0;
  margin-bottom: 4px;
  text-align: center;
}
.odo-helper input[type=number] {
  width: 80px;
}

#calc-btn {
  position: absolute;
  top: -27px;
  left: 30%;
  border: 2px solid aqua;
  border-radius: 12px 12px 0 0;
  background: #3Da;
  width: 40%;
  height: 25px;
  cursor: pointer;
}

.count-block {
  position: relative;
  border: 1px solid #00E9FA;
  padding: 6px;
  margin-bottom: 9px;
  max-width: 480px;
}
.count-block p {
  margin: 2px;
  display: inline-block;
  width: 150px;
  border: 1px solid #2CD1C1;
  text-align: center;
}
.count-block p input {
  border: 0;
  background: rgba(177, 245, 250, 0.5);
  font-size: 1em;
  color: blue;
}
.count-block p span {
  color: red;
  font-size: 1.1em;
}
.count-block .del-btn, .count-block .reset-btn {
  position: absolute;
  top: 0;
  right: -20px;
  background: grey;
  border: 0;
  border-radius: 30%;
  font-size: 9px;
  cursor: pointer;
}
.count-block .reset-btn {
  top: 15px;
}

.summary {
  margin-top: 45px;
  position: relative;
  border: 2px solid #3Da;
  max-width: 300px;
}
.summary p {
  margin: 3px;
  border-bottom: 1px dotted #3da;
}
.summary p span {
  color: red;
  font-size: 1.1em;
}

.article {
  margin: -1.1em;
  background: inherit;
  border-right: 0;
  border-left: 0;
  padding: 5% 0 1% 0;
  transform: translateY(50px);
  /* transform:scale(1.2); */
}