.equation {
    display: flex;
    align-items: center;
    margin-bottom: 10px;
/*     max-width: 500px; */
}

.equation img {
    height: 50px;
    cursor: pointer;
}

.btn {
/*     width: 40px; */
    height: 40px;
}
.equation .disableBtn, .equation .deleteBtn {
    margin-left: 10px;
}

.disabled {  opacity: 0.5;
}

#equationsContainer {
    margin-top: 5px;
}

.selector {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 50%;
    height: 50%;
    background-color: #F0F0F0;
    z-index: 2;
    border: 1px solid #ccc;
    border-radius: 10px;
    overflow: hidden;
}

.option {
    height: 50px;
    margin: 10px;
    cursor: pointer;
}

.sign_plus {
    font-size: 30px;
    margin-left: 5px;
    margin-right: 5px;
}

.sign_eq {
    font-size: 30px;
    margin-left: 10px;
    width: 20px;
/*     margin-right: 5px; */
}

#indicator{
    display: "block";
    position: absolute;
    width: 20px;
    height: 20px;
}

.indicator-on {
    background-color: #f00f;
}
.indicator-off {
    background-color: #0f00;
}

#table-chem table {
    border-collapse: collapse;
/*     width: 100%; */
}

/*#table-chem tr {
    width: 500px;
}*/

#table-chem td {
    border: 1px solid #ccc;
    text-align: center;
    vertical-align: middle;
}

#table-chem img {
    display: block;
    float: left;
    width: 50px;
    margin: auto;
}

#table-chem div {
    display: flex;
    justify-content: center;
    align-content: center;
    flex-direction: column;
}

#table-chem span {
    color: black;
    display: block;
/*     font-weight: bold; */
    margin: auto;
}

@media only screen and (max-width: 600px) {
    #table-chem img {
        width: 90%;
    }

}