body {
    background:#E8E8E8
}
.page{
    width:  700px
    height: 1000px:
    position: relative;
}
.page .top{
    height: 200px;
    position: relative;
}
.page .middle {
    height: 600px;
    position: relative;
}
.page .bottom {
    height: 200px;
    position: relative;
}
.container_cake {
    width: 700px;
    height: 50px;
    border: 1px;
    position: absolute;
    top: 20px;
}
.rectangle_agent_transparent {
    position: absolute;
    top: 0px;
    left: 0px;
    height: 50px;
    width: 0px;
    background-color: green;
    opacity: 0.3;
}
.rectangle_agent_not_transparent {
    position: absolute;
    top: 0px;
    left: 0px;
    height: 50px;
    width: 0px;
    background-color: green;
    opacity: 0.7;
}
.rectangle_principal_transparent {
    position: absolute;
    top: 0px;
    left: 600px;
    height: 50px;
    width: 0px;
    background-color: blue;
    opacity: 0.3;
}
.rectangle_principal_not_transparent {
    position: absolute;
    top: 0px;
    left: 600px;
    height: 50px;
    width: 0px;
    background-color: blue;
    opacity: 0.7;
}
.slim_rectangle_principal {
    position: absolute;
    top: 0px;
    left: 0px;
    height: 50px;
    width: 3px;
    background-color: blue;
}
.slim_rectangle_agent {
    position: absolute;
    top: 0px;
    left: 0px;
    height: 50px;
    width: 3px;
    background-color: green;
}
.container_slider {
    width: 620px;
    height: 15px;
    border: 1px;
    position: absolute;
    top: 40px;
    left: -10px;
}
.slider_principal {
    -webkit-appearance: none;
    width: 100%;
    height: 5px;
    border-radius: 5px;
    background: #E8E8E8;
    outline: none;
    opacity: 1;
    -webkit-transition: .2s;
    transition: opacity .2s;
}
.slider_principal::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: blue;
    cursor: pointer;
}
.slider_principal::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: blue;
    cursor: pointer;
}
.slider_agent {
    -webkit-appearance: none;
    width: 100%;
    height: 5px;
    border-radius: 5px;
    background: #E8E8E8;
    outline: none;
    opacity: 1;
    -webkit-transition: .2s;
    transition: opacity .2s;
}
.slider_agent::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: green;
    cursor: pointer;
}
.slider_agent::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: green;
    cursor: pointer;
}
.button_div {
    position: absolute;
    top: 250px;
    left: 140px;
}
.dot_principal {
    height: 18px;
    width: 18px;
    background-color: blue;
    border-radius: 50%;
    display: inline-block;
}
.dot_agent {
    height: 18px;
    width: 18px;
    background-color: green;
    border-radius: 50%;
    display: inline-block;
}