.arrow-r {
    width: 0;
    height: 0;
    border-top: 5px solid transparent;
    border-bottom: 5px solid transparent;
    border-left: 5px solid #444;
    margin-bottom: 1%;
    margin-right: 7px;
    margin-left: 3px;
    display: inline-block;
}

.arrow-d {
    width: 0;
    height: 0;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 5px solid #444;
    margin-bottom: 6px;
    margin-right: 5px;
    display: inline-block;
}

.collapse-container>:nth-child(odd) {
    padding: 5px;
    background-color: gray;
    background-image: linear-gradient(bottom, gray 14%, #969696 70%);
    background-image: -o-linear-gradient(bottom, gray 14%, #969696 70%);
    background-image: -moz-linear-gradient(bottom, gray 14%, #969696 70%);
    background-image: -webkit-linear-gradient(bottom, gray 14%, #969696 70%);
    background-image: -ms-linear-gradient(bottom, gray 14%, #969696 70%);
    border: 1px solid black;
    margin: auto;
}
.collapse-container>:nth-child(even) {
    background-color: white;
    -moz-box-sizing: border-box;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
    border: 1px solid black;
}
.collapse-container>:nth-child(even) p {
    padding: 0px 5px;
}

.collapse-container>:nth-child(odd):hover {
    cursor: pointer;
    -moz-user-select: none; /* mozilla browsers */
    -khtml-user-select: none; /* webkit browsers */
}