html,
body {
  overflow: hidden;
}

#mainContainer {
  display: flex;
  justify-content: center;
}
#container {
  width: 1330px;
  height: 610px;

  flex-direction: column;
  background: url("../images/Background_sim_new.jpg") no-repeat;
  justify-content: center;
}
#header {
  width: 100%;
  height: 80px;
  text-align: left;
  margin-left: 20%;
}

#simulation {
  display: flex;
}
#leftPane {
  width: 25%;
  margin-left: 15px;
}
#rightPane {
  width: 15%;
}
#middlePane {
  width: 60%;
}

#initialMassValue1 {
  margin-left: 20%;
}
#initialMassValue2 {
  margin-left: 20%;
}
#initialVelocityValue1 {
  margin-left: 20%;
}
#initialLengthValue1 {
  margin-left: 20%;
}
#initialLengthValue2 {
  margin-left: 20%;
}

.lock {
  margin-left: 10%;
  display: inline-block;
}
#lockCheckbox {
  margin-left: 2%;
  height: 20px;
  width: 20px;
  display: inline-block;
}
.glider {
  position: absolute; /* Set child elements to position: absolute */
  width: 140px;
  height: 80px;
}

.control_heading {
  font-size: 18px;
  margin-bottom: 2%;
}
.play {
  font-size: 18px;
  margin-top: 10%;
}
#playButton {
  border: none;
  cursor: pointer;
  appearance: none;
  background-color: inherit;
  margin-left: 2%;
  margin-top: 0%;
  margin-bottom: 10%;
}

.reset {
  font-size: 18px;
}
#resetButton {
  position: absolute;
  border: none;
  cursor: pointer;
  appearance: none;
  background-color: inherit;
  margin-left: 1.9%;
  margin-top: -0.5%;
}
/* 
#redGlider_inelastic {
    align-items: left;
	margin-top: -46%;
	margin-left: 3.5%;
	left: 0;
    top: 0;
}

#redGlider_inelastic img {
    width: 140px;
    height: 80px;
}
#blueGlider_inelastic{
	align-items: center;
	margin-top: -11.5%;
	margin-left: 46%;
}
#blueGlider_inelastic img {
    width: 140px;
    height: 80px;
} */
.table_button {
  font-size: 0.85em;
  padding: 8px;
  position: absolute;
  margin-top: 5%;
  color: #000;
  border: 2px solid #000;
  border-radius: 20px/50px;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease-out;
}
.table_button:hover {
  background: #78b5e3;
}
.overlay {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(0, 0, 0, 0.7);
  transition: opacity 500ms;
  visibility: hidden;
  opacity: 0;
}
.overlay:target {
  visibility: visible;
  opacity: 1;
}

.popup {
  margin: 20px auto;
  padding: 20px;
  background: #fff;
  border-radius: 5px;
  width: 70%;
  position: relative;
  transition: all 5s ease-in-out;
}

.popup h2 {
  margin-top: 0;
  color: #333;
  font-family: Tahoma, Arial, sans-serif;
}
.popup .close {
  position: absolute;
  top: 20px;
  right: 30px;
  transition: all 200ms;
  font-size: 30px;
  font-weight: bold;
  text-decoration: none;
  color: #333;
}
.popup .close:hover {
  color: #78b5e3;
}
.popup .content {
  max-height: 30%;
  overflow: auto;
}

table {
  font-family: arial, sans-serif;
  border-collapse: collapse;
  width: 100%;
}

td,
th {
  border: 1px solid #000;
  text-align: left;
  font-size: medium;
  padding: 3px;
}

tr:nth-child(even) {
  background-color: #dddddd;
}
#copyright {
  position: absolute;
  left: 280px;
  top: 600px;
  height: 10px;
  width: 2300px;
  text-align: center;
  font-size: 12px;
  font-family: sans-serif;
}